diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..1e30cbf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,21 @@
+.DS_Store
+.gradle
+/build/
+!gradle/wrapper/gradle-wrapper.jar
+/out/
+/target/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+bin/
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
diff --git a/README.md b/README.md
index 60b6c44..8262061 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,10 @@
-# java-bowling
\ No newline at end of file
+# java-bowling
+# 볼링 게임 점수판
+## 진행 방법
+* 볼링 게임 점수판 요구사항을 파악한다.
+* 요구사항에 대한 구현을 완료한 후 자신의 github 아이디에 해당하는 브랜치에 Pull Request(이하 PR)를 통해 코드 리뷰 요청을 한다.
+* 코드 리뷰 피드백에 대한 개선 작업을 하고 다시 PUSH한다.
+* 모든 피드백을 완료하면 다음 단계를 도전하고 앞의 과정을 반복한다.
+
+## 온라인 코드 리뷰 과정
+* [텍스트와 이미지로 살펴보는 온라인 코드 리뷰 과정](https://github.com/next-step/nextstep-docs/tree/master/codereview)
diff --git a/build.gradle b/build.gradle
new file mode 100644
index 0000000..e89ad5f
--- /dev/null
+++ b/build.gradle
@@ -0,0 +1,36 @@
+buildscript {
+    ext {
+        springBootVersion = '2.2.6.RELEASE'
+    }
+    repositories {
+        mavenCentral()
+    }
+    dependencies {
+        classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
+    }
+}
+
+apply plugin: 'java'
+apply plugin: 'eclipse'
+apply plugin: 'org.springframework.boot'
+apply plugin: 'io.spring.dependency-management'
+
+version = '1.0.0'
+sourceCompatibility = 1.8
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    compile('org.springframework.boot:spring-boot-starter-data-jpa')
+    compile('org.hibernate:hibernate-java8')
+    runtime('com.h2database:h2')
+    testCompile('org.junit.jupiter:junit-jupiter:5.6.0')
+    testCompile('org.assertj:assertj-core:3.15.0')
+    testCompile('org.springframework.boot:spring-boot-starter-test')
+}
+
+test {
+    useJUnitPlatform()
+}
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..87b738c
Binary files /dev/null and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..4f77ab0
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,6 @@
+#Sat Apr 04 17:02:42 KST 2020
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.10.3-all.zip
diff --git a/gradlew b/gradlew
new file mode 100755
index 0000000..af6708f
--- /dev/null
+++ b/gradlew
@@ -0,0 +1,172 @@
+#!/usr/bin/env sh
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=$(save "$@")
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
+if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
+  cd "$(dirname "$0")"
+fi
+
+exec "$JAVACMD" "$@"
diff --git a/gradlew.bat b/gradlew.bat
new file mode 100644
index 0000000..6d57edc
--- /dev/null
+++ b/gradlew.bat
@@ -0,0 +1,84 @@
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/src/main/java/bowling/empty.txt b/src/main/java/bowling/empty.txt
new file mode 100644
index 0000000..e69de29
diff --git a/src/main/java/qna/CannotDeleteException.java b/src/main/java/qna/CannotDeleteException.java
new file mode 100644
index 0000000..12ea9bc
--- /dev/null
+++ b/src/main/java/qna/CannotDeleteException.java
@@ -0,0 +1,9 @@
+package qna;
+
+public class CannotDeleteException extends Exception {
+    private static final long serialVersionUID = 1L;
+
+    public CannotDeleteException(String message) {
+        super(message);
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/qna/ForbiddenException.java b/src/main/java/qna/ForbiddenException.java
new file mode 100644
index 0000000..e9540d5
--- /dev/null
+++ b/src/main/java/qna/ForbiddenException.java
@@ -0,0 +1,10 @@
+package qna;
+
+public class ForbiddenException extends RuntimeException{
+    public ForbiddenException() {
+    }
+
+    public ForbiddenException(String message) {
+        super(message);
+    }
+}
diff --git a/src/main/java/qna/NotFoundException.java b/src/main/java/qna/NotFoundException.java
new file mode 100644
index 0000000..5fd0ff0
--- /dev/null
+++ b/src/main/java/qna/NotFoundException.java
@@ -0,0 +1,4 @@
+package qna;
+
+public class NotFoundException extends RuntimeException {
+}
diff --git a/src/main/java/qna/QnaApplication.java b/src/main/java/qna/QnaApplication.java
new file mode 100755
index 0000000..105b77a
--- /dev/null
+++ b/src/main/java/qna/QnaApplication.java
@@ -0,0 +1,15 @@
+package qna;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.EnableAspectJAutoProxy;
+import org.springframework.data.jpa.repository.config.EnableJpaAuditing;
+
+@SpringBootApplication
+@EnableJpaAuditing
+@EnableAspectJAutoProxy(proxyTargetClass = true)
+public class QnaApplication {
+    public static void main(String[] args) {
+        SpringApplication.run(QnaApplication.class, args);
+    }
+}
diff --git a/src/main/java/qna/UnAuthenticationException.java b/src/main/java/qna/UnAuthenticationException.java
new file mode 100644
index 0000000..a75ff49
--- /dev/null
+++ b/src/main/java/qna/UnAuthenticationException.java
@@ -0,0 +1,26 @@
+package qna;
+
+public class UnAuthenticationException extends Exception {
+    private static final long serialVersionUID = 1L;
+
+    public UnAuthenticationException() {
+        super();
+    }
+
+    public UnAuthenticationException(String message, Throwable cause, boolean enableSuppression,
+                                     boolean writableStackTrace) {
+        super(message, cause, enableSuppression, writableStackTrace);
+    }
+
+    public UnAuthenticationException(String message, Throwable cause) {
+        super(message, cause);
+    }
+
+    public UnAuthenticationException(String message) {
+        super(message);
+    }
+
+    public UnAuthenticationException(Throwable cause) {
+        super(cause);
+    }
+}
diff --git a/src/main/java/qna/UnAuthorizedException.java b/src/main/java/qna/UnAuthorizedException.java
new file mode 100644
index 0000000..5acd14e
--- /dev/null
+++ b/src/main/java/qna/UnAuthorizedException.java
@@ -0,0 +1,26 @@
+package qna;
+
+public class UnAuthorizedException extends RuntimeException {
+    private static final long serialVersionUID = 1L;
+
+    public UnAuthorizedException() {
+        super();
+    }
+
+    public UnAuthorizedException(String message, Throwable cause, boolean enableSuppression,
+                                 boolean writableStackTrace) {
+        super(message, cause, enableSuppression, writableStackTrace);
+    }
+
+    public UnAuthorizedException(String message, Throwable cause) {
+        super(message, cause);
+    }
+
+    public UnAuthorizedException(String message) {
+        super(message);
+    }
+
+    public UnAuthorizedException(Throwable cause) {
+        super(cause);
+    }
+}
diff --git a/src/main/java/qna/domain/AbstractEntity.java b/src/main/java/qna/domain/AbstractEntity.java
new file mode 100644
index 0000000..117ce7c
--- /dev/null
+++ b/src/main/java/qna/domain/AbstractEntity.java
@@ -0,0 +1,70 @@
+package qna.domain;
+
+import org.springframework.data.annotation.CreatedDate;
+import org.springframework.data.annotation.LastModifiedDate;
+import org.springframework.data.jpa.domain.support.AuditingEntityListener;
+
+import javax.persistence.*;
+import java.time.LocalDateTime;
+
+@MappedSuperclass
+@EntityListeners(AuditingEntityListener.class)
+public class AbstractEntity {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @Column(nullable = false, updatable = false)
+    @CreatedDate
+    private LocalDateTime createdAt;
+
+    @LastModifiedDate
+    private LocalDateTime updatedAt;
+
+    public AbstractEntity() {
+    }
+
+    public AbstractEntity(Long id) {
+        this.id = id;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public AbstractEntity setId(Long id) {
+        this.id = id;
+        return this;
+    }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + (int) (id ^ (id >>> 32));
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null)
+            return false;
+        if (getClass() != obj.getClass())
+            return false;
+        AbstractEntity other = (AbstractEntity) obj;
+        if (id != other.id)
+            return false;
+        return true;
+    }
+
+    @Override
+    public String toString() {
+        return "AbstractEntity{" +
+                "id=" + id +
+                ", createdAt=" + createdAt +
+                ", updatedAt=" + updatedAt +
+                '}';
+    }
+}
diff --git a/src/main/java/qna/domain/Answer.java b/src/main/java/qna/domain/Answer.java
new file mode 100644
index 0000000..548b71e
--- /dev/null
+++ b/src/main/java/qna/domain/Answer.java
@@ -0,0 +1,75 @@
+package qna.domain;
+
+import qna.NotFoundException;
+import qna.UnAuthorizedException;
+
+import javax.persistence.*;
+
+@Entity
+public class Answer extends AbstractEntity {
+    @ManyToOne(optional = false)
+    @JoinColumn(foreignKey = @ForeignKey(name = "fk_answer_writer"))
+    private User writer;
+
+    @ManyToOne(optional = false)
+    @JoinColumn(foreignKey = @ForeignKey(name = "fk_answer_to_question"))
+    private Question question;
+
+    @Lob
+    private String contents;
+
+    private boolean deleted = false;
+
+    public Answer() {
+    }
+
+    public Answer(User writer, Question question, String contents) {
+        this(null, writer, question, contents);
+    }
+
+    public Answer(Long id, User writer, Question question, String contents) {
+        super(id);
+
+        if(writer == null) {
+            throw new UnAuthorizedException();
+        }
+
+        if(question == null) {
+            throw new NotFoundException();
+        }
+
+        this.writer = writer;
+        this.question = question;
+        this.contents = contents;
+    }
+
+    public Answer setDeleted(boolean deleted) {
+        this.deleted = deleted;
+        return this;
+    }
+
+    public boolean isDeleted() {
+        return deleted;
+    }
+
+    public boolean isOwner(User writer) {
+        return this.writer.equals(writer);
+    }
+
+    public User getWriter() {
+        return writer;
+    }
+
+    public String getContents() {
+        return contents;
+    }
+
+    public void toQuestion(Question question) {
+        this.question = question;
+    }
+
+    @Override
+    public String toString() {
+        return "Answer [id=" + getId() + ", writer=" + writer + ", contents=" + contents + "]";
+    }
+}
diff --git a/src/main/java/qna/domain/AnswerRepository.java b/src/main/java/qna/domain/AnswerRepository.java
new file mode 100644
index 0000000..872e1cd
--- /dev/null
+++ b/src/main/java/qna/domain/AnswerRepository.java
@@ -0,0 +1,12 @@
+package qna.domain;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.List;
+import java.util.Optional;
+
+public interface AnswerRepository extends JpaRepository<Answer, Long> {
+    List<Answer> findByQuestionAndDeletedFalse(Question question);
+
+    Optional<Answer> findByIdAndDeletedFalse(Long id);
+}
diff --git a/src/main/java/qna/domain/ContentType.java b/src/main/java/qna/domain/ContentType.java
new file mode 100644
index 0000000..55bc6a2
--- /dev/null
+++ b/src/main/java/qna/domain/ContentType.java
@@ -0,0 +1,5 @@
+package qna.domain;
+
+public enum ContentType {
+    QUESTION, ANSWER;
+}
diff --git a/src/main/java/qna/domain/DeleteHistory.java b/src/main/java/qna/domain/DeleteHistory.java
new file mode 100644
index 0000000..db03c60
--- /dev/null
+++ b/src/main/java/qna/domain/DeleteHistory.java
@@ -0,0 +1,55 @@
+package qna.domain;
+
+import javax.persistence.*;
+import java.time.LocalDateTime;
+import java.util.Objects;
+
+@Entity
+public class DeleteHistory {
+    @Id
+    @GeneratedValue
+    private Long id;
+
+    @Enumerated(EnumType.STRING)
+    private ContentType contentType;
+
+    private Long contentId;
+
+    @ManyToOne
+    @JoinColumn(foreignKey = @ForeignKey(name = "fk_deletehistory_to_user"))
+    private User deletedBy;
+
+    private LocalDateTime createDate = LocalDateTime.now();
+
+    public DeleteHistory() {
+    }
+
+    public DeleteHistory(ContentType contentType, Long contentId, User deletedBy, LocalDateTime createDate) {
+        this.contentType = contentType;
+        this.contentId = contentId;
+        this.deletedBy = deletedBy;
+        this.createDate = createDate;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        DeleteHistory that = (DeleteHistory) o;
+        return Objects.equals(id, that.id) &&
+                contentType == that.contentType &&
+                Objects.equals(contentId, that.contentId) &&
+                Objects.equals(deletedBy, that.deletedBy);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, contentType, contentId, deletedBy);
+    }
+
+    @Override
+    public String toString() {
+        return "DeleteHistory [id=" + id + ", contentType=" + contentType + ", contentId=" + contentId + ", deletedBy="
+                + deletedBy + ", createDate=" + createDate + "]";
+    }
+}
diff --git a/src/main/java/qna/domain/DeleteHistoryRepository.java b/src/main/java/qna/domain/DeleteHistoryRepository.java
new file mode 100644
index 0000000..28ad228
--- /dev/null
+++ b/src/main/java/qna/domain/DeleteHistoryRepository.java
@@ -0,0 +1,7 @@
+package qna.domain;
+
+import org.springframework.data.repository.CrudRepository;
+
+public interface DeleteHistoryRepository extends CrudRepository<DeleteHistory, Long> {
+
+}
diff --git a/src/main/java/qna/domain/Question.java b/src/main/java/qna/domain/Question.java
new file mode 100644
index 0000000..1e8bb11
--- /dev/null
+++ b/src/main/java/qna/domain/Question.java
@@ -0,0 +1,95 @@
+package qna.domain;
+
+import org.hibernate.annotations.Where;
+
+import javax.persistence.*;
+import java.util.ArrayList;
+import java.util.List;
+
+@Entity
+public class Question extends AbstractEntity {
+    @Column(length = 100, nullable = false)
+    private String title;
+
+    @Lob
+    private String contents;
+
+    @ManyToOne
+    @JoinColumn(foreignKey = @ForeignKey(name = "fk_question_writer"))
+    private User writer;
+
+    @OneToMany(mappedBy = "question", cascade = CascadeType.ALL)
+    @Where(clause = "deleted = false")
+    @OrderBy("id ASC")
+    private List<Answer> answers = new ArrayList<>();
+
+    private boolean deleted = false;
+
+    public Question() {
+    }
+
+    public Question(String title, String contents) {
+        this.title = title;
+        this.contents = contents;
+    }
+
+    public Question(long id, String title, String contents) {
+        super(id);
+        this.title = title;
+        this.contents = contents;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public Question setTitle(String title) {
+        this.title = title;
+        return this;
+    }
+
+    public String getContents() {
+        return contents;
+    }
+
+    public Question setContents(String contents) {
+        this.contents = contents;
+        return this;
+    }
+
+    public User getWriter() {
+        return writer;
+    }
+
+    public Question writeBy(User loginUser) {
+        this.writer = loginUser;
+        return this;
+    }
+
+    public void addAnswer(Answer answer) {
+        answer.toQuestion(this);
+        answers.add(answer);
+    }
+
+    public boolean isOwner(User loginUser) {
+        return writer.equals(loginUser);
+    }
+
+    public Question setDeleted(boolean deleted) {
+        this.deleted = deleted;
+        return this;
+    }
+
+    public boolean isDeleted() {
+        return deleted;
+    }
+
+    public List<Answer> getAnswers() {
+        return answers;
+    }
+
+    @Override
+    public String toString() {
+        return "Question [id=" + getId() + ", title=" + title + ", contents=" + contents + ", writer=" + writer + "]";
+    }
+}
diff --git a/src/main/java/qna/domain/QuestionRepository.java b/src/main/java/qna/domain/QuestionRepository.java
new file mode 100644
index 0000000..8a9dced
--- /dev/null
+++ b/src/main/java/qna/domain/QuestionRepository.java
@@ -0,0 +1,12 @@
+package qna.domain;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.List;
+import java.util.Optional;
+
+public interface QuestionRepository extends JpaRepository<Question, Long> {
+    List<Question> findByDeletedFalse();
+
+    Optional<Question> findByIdAndDeletedFalse(Long id);
+}
diff --git a/src/main/java/qna/domain/User.java b/src/main/java/qna/domain/User.java
new file mode 100755
index 0000000..bc0eb53
--- /dev/null
+++ b/src/main/java/qna/domain/User.java
@@ -0,0 +1,120 @@
+package qna.domain;
+
+import qna.UnAuthorizedException;
+
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import java.util.Objects;
+
+@Entity
+public class User extends AbstractEntity {
+    public static final GuestUser GUEST_USER = new GuestUser();
+
+    @Column(unique = true, nullable = false)
+    private String userId;
+
+    @Column(nullable = false)
+    private String password;
+
+    @Column(nullable = false)
+    private String name;
+
+    private String email;
+
+    public User() {
+    }
+
+    public User(String userId, String password, String name, String email) {
+        this(null, userId, password, name, email);
+    }
+
+    public User(Long id, String userId, String password, String name, String email) {
+        super(id);
+        this.userId = userId;
+        this.password = password;
+        this.name = name;
+        this.email = email;
+    }
+
+    public String getUserId() {
+        return userId;
+    }
+
+    public User setUserId(String userId) {
+        this.userId = userId;
+        return this;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public User setPassword(String password) {
+        this.password = password;
+        return this;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public User setName(String name) {
+        this.name = name;
+        return this;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public User setEmail(String email) {
+        this.email = email;
+        return this;
+    }
+
+    public void update(User loginUser, User target) {
+        if (!matchUserId(loginUser.getUserId())) {
+            throw new UnAuthorizedException();
+        }
+
+        if (!matchPassword(target.getPassword())) {
+            throw new UnAuthorizedException();
+        }
+
+        this.name = target.name;
+        this.email = target.email;
+    }
+
+    private boolean matchUserId(String userId) {
+        return this.userId.equals(userId);
+    }
+
+    public boolean matchPassword(String targetPassword) {
+        return password.equals(targetPassword);
+    }
+
+    public boolean equalsNameAndEmail(User target) {
+        if (Objects.isNull(target)) {
+            return false;
+        }
+
+        return name.equals(target.name) &&
+                email.equals(target.email);
+    }
+
+    public boolean isGuestUser() {
+        return false;
+    }
+
+    private static class GuestUser extends User {
+        @Override
+        public boolean isGuestUser() {
+            return true;
+        }
+    }
+
+    @Override
+    public String toString() {
+        return "User [userId=" + userId + ", password=" + password + ", name=" + name + ", email=" + email + "]";
+    }
+}
diff --git a/src/main/java/qna/domain/UserRepository.java b/src/main/java/qna/domain/UserRepository.java
new file mode 100755
index 0000000..14b3d67
--- /dev/null
+++ b/src/main/java/qna/domain/UserRepository.java
@@ -0,0 +1,9 @@
+package qna.domain;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.Optional;
+
+public interface UserRepository extends JpaRepository<User, Long> {
+    Optional<User> findByUserId(String userId);
+}
diff --git a/src/main/java/qna/service/DeleteHistoryService.java b/src/main/java/qna/service/DeleteHistoryService.java
new file mode 100644
index 0000000..f962036
--- /dev/null
+++ b/src/main/java/qna/service/DeleteHistoryService.java
@@ -0,0 +1,26 @@
+package qna.service;
+
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Propagation;
+import org.springframework.transaction.annotation.Transactional;
+import qna.domain.DeleteHistory;
+import qna.domain.DeleteHistoryRepository;
+
+import javax.annotation.Resource;
+import java.util.List;
+
+@Service("deleteHistoryService")
+public class DeleteHistoryService {
+    @Resource(name = "deleteHistoryRepository")
+    private DeleteHistoryRepository deleteHistoryRepository;
+
+    @Transactional(propagation = Propagation.REQUIRES_NEW)
+    public void saveAll(List<DeleteHistory> deleteHistories) {
+        deleteHistoryRepository.saveAll(deleteHistories);
+    }
+
+    @Transactional(propagation = Propagation.REQUIRES_NEW)
+    public void save(DeleteHistory deleteHistory) {
+        deleteHistoryRepository.save(deleteHistory);
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/qna/service/QnAService.java b/src/main/java/qna/service/QnAService.java
new file mode 100644
index 0000000..66821cd
--- /dev/null
+++ b/src/main/java/qna/service/QnAService.java
@@ -0,0 +1,58 @@
+package qna.service;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+import qna.CannotDeleteException;
+import qna.NotFoundException;
+import qna.domain.*;
+
+import javax.annotation.Resource;
+import java.time.LocalDateTime;
+import java.util.ArrayList;
+import java.util.List;
+
+@Service("qnaService")
+public class QnAService {
+    private static final Logger log = LoggerFactory.getLogger(QnAService.class);
+
+    @Resource(name = "questionRepository")
+    private QuestionRepository questionRepository;
+
+    @Resource(name = "answerRepository")
+    private AnswerRepository answerRepository;
+
+    @Resource(name = "deleteHistoryService")
+    private DeleteHistoryService deleteHistoryService;
+
+    @Transactional(readOnly = true)
+    public Question findQuestionById(Long id) {
+        return questionRepository.findByIdAndDeletedFalse(id)
+                .orElseThrow(NotFoundException::new);
+    }
+
+    @Transactional
+    public void deleteQuestion(User loginUser, long questionId) throws CannotDeleteException {
+        Question question = findQuestionById(questionId);
+        if (!question.isOwner(loginUser)) {
+            throw new CannotDeleteException("질문을 삭제할 권한이 없습니다.");
+        }
+
+        List<Answer> answers = question.getAnswers();
+        for (Answer answer : answers) {
+            if (!answer.isOwner(loginUser)) {
+                throw new CannotDeleteException("다른 사람이 쓴 답변이 있어 삭제할 수 없습니다.");
+            }
+        }
+
+        List<DeleteHistory> deleteHistories = new ArrayList<>();
+        question.setDeleted(true);
+        deleteHistories.add(new DeleteHistory(ContentType.QUESTION, questionId, question.getWriter(), LocalDateTime.now()));
+        for (Answer answer : answers) {
+            answer.setDeleted(true);
+            deleteHistories.add(new DeleteHistory(ContentType.ANSWER, answer.getId(), answer.getWriter(), LocalDateTime.now()));
+        }
+        deleteHistoryService.saveAll(deleteHistories);
+    }
+}
diff --git a/src/main/resources/application.properties b/src/main/resources/application.properties
new file mode 100755
index 0000000..befbb0f
--- /dev/null
+++ b/src/main/resources/application.properties
@@ -0,0 +1,11 @@
+spring.h2.console.enabled=true
+
+spring.datasource.url=jdbc:h2:mem://localhost/~/java-qna-atdd;MVCC=TRUE;DB_CLOSE_ON_EXIT=FALSE
+
+spring.jpa.show-sql=true
+spring.jpa.properties.hibernate.format_sql=true
+spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
+
+logging.level.org.hibernate.type.descriptor.sql.BasicBinder=TRACE
+
+server.servlet.session.tracking-modes=cookie
\ No newline at end of file
diff --git a/src/test/java/bowling/empty.txt b/src/test/java/bowling/empty.txt
new file mode 100644
index 0000000..e69de29
diff --git a/src/test/java/qna/domain/AnswerTest.java b/src/test/java/qna/domain/AnswerTest.java
new file mode 100644
index 0000000..d858181
--- /dev/null
+++ b/src/test/java/qna/domain/AnswerTest.java
@@ -0,0 +1,6 @@
+package qna.domain;
+
+public class AnswerTest {
+    public static final Answer A1 = new Answer(UserTest.JAVAJIGI, QuestionTest.Q1, "Answers Contents1");
+    public static final Answer A2 = new Answer(UserTest.SANJIGI, QuestionTest.Q1, "Answers Contents2");
+}
diff --git a/src/test/java/qna/domain/QuestionTest.java b/src/test/java/qna/domain/QuestionTest.java
new file mode 100644
index 0000000..b48c9a2
--- /dev/null
+++ b/src/test/java/qna/domain/QuestionTest.java
@@ -0,0 +1,6 @@
+package qna.domain;
+
+public class QuestionTest {
+    public static final Question Q1 = new Question("title1", "contents1").writeBy(UserTest.JAVAJIGI);
+    public static final Question Q2 = new Question("title2", "contents2").writeBy(UserTest.SANJIGI);
+}
diff --git a/src/test/java/qna/domain/UserTest.java b/src/test/java/qna/domain/UserTest.java
new file mode 100644
index 0000000..4f0936e
--- /dev/null
+++ b/src/test/java/qna/domain/UserTest.java
@@ -0,0 +1,6 @@
+package qna.domain;
+
+public class UserTest {
+    public static final User JAVAJIGI = new User(1L, "javajigi", "password", "name", "javajigi@slipp.net");
+    public static final User SANJIGI = new User(2L, "sanjigi", "password", "name", "sanjigi@slipp.net");
+}
diff --git a/src/test/java/qna/service/QnaServiceTest.java b/src/test/java/qna/service/QnaServiceTest.java
new file mode 100644
index 0000000..c601a79
--- /dev/null
+++ b/src/test/java/qna/service/QnaServiceTest.java
@@ -0,0 +1,89 @@
+package qna.service;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.MockitoJUnitRunner;
+import qna.CannotDeleteException;
+import qna.domain.*;
+
+import java.time.LocalDateTime;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Optional;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+@RunWith(MockitoJUnitRunner.class)
+public class QnaServiceTest {
+    @Mock
+    private QuestionRepository questionRepository;
+
+    @Mock
+    private DeleteHistoryService deleteHistoryService;
+
+    @InjectMocks
+    private QnAService qnAService;
+
+    private Question question;
+    private Answer answer;
+
+    @Before
+    public void setUp() throws Exception {
+        question = new Question(1L, "title1", "contents1").writeBy(UserTest.JAVAJIGI);
+        answer = new Answer(11L, UserTest.JAVAJIGI, QuestionTest.Q1, "Answers Contents1");
+        question.addAnswer(answer);
+    }
+
+    @Test
+    public void delete_성공() throws Exception {
+        when(questionRepository.findByIdAndDeletedFalse(question.getId())).thenReturn(Optional.of(question));
+
+        assertThat(question.isDeleted()).isFalse();
+        qnAService.deleteQuestion(UserTest.JAVAJIGI, question.getId());
+
+        assertThat(question.isDeleted()).isTrue();
+        verifyDeleteHistories();
+    }
+
+    @Test
+    public void delete_다른_사람이_쓴_글() throws Exception {
+        when(questionRepository.findByIdAndDeletedFalse(question.getId())).thenReturn(Optional.of(question));
+
+        assertThatThrownBy(() -> {
+            qnAService.deleteQuestion(UserTest.SANJIGI, question.getId());
+        }).isInstanceOf(CannotDeleteException.class);
+    }
+
+    @Test
+    public void delete_성공_질문자_답변자_같음() throws Exception {
+        when(questionRepository.findByIdAndDeletedFalse(question.getId())).thenReturn(Optional.of(question));
+
+        qnAService.deleteQuestion(UserTest.JAVAJIGI, question.getId());
+
+        assertThat(question.isDeleted()).isTrue();
+        assertThat(answer.isDeleted()).isTrue();
+        verifyDeleteHistories();
+    }
+
+    @Test
+    public void delete_답변_중_다른_사람이_쓴_글() throws Exception {
+        when(questionRepository.findByIdAndDeletedFalse(question.getId())).thenReturn(Optional.of(question));
+
+        assertThatThrownBy(() -> {
+            qnAService.deleteQuestion(UserTest.SANJIGI, question.getId());
+        }).isInstanceOf(CannotDeleteException.class);
+    }
+
+    private void verifyDeleteHistories() {
+        List<DeleteHistory> deleteHistories = Arrays.asList(
+                new DeleteHistory(ContentType.QUESTION, question.getId(), question.getWriter(), LocalDateTime.now()),
+                new DeleteHistory(ContentType.ANSWER, answer.getId(), answer.getWriter(), LocalDateTime.now()));
+        verify(deleteHistoryService).saveAll(deleteHistories);
+    }
+}