diff --git a/src/main/java/oncoding/concoder/model/.gitkeep b/src/main/java/oncoding/concoder/model/.gitkeep
deleted file mode 100644
index e69de29..0000000
diff --git a/src/main/java/oncoding/concoder/model/Category.java b/src/main/java/oncoding/concoder/model/Category.java
new file mode 100644
index 0000000..b1ad847
--- /dev/null
+++ b/src/main/java/oncoding/concoder/model/Category.java
@@ -0,0 +1,17 @@
+package oncoding.concoder.model;
+
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.validation.constraints.NotNull;
+import lombok.AccessLevel;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Getter
+@Entity
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+public class Category extends JpaBaseEntity {
+    @Column
+    @NotNull
+    private String name;
+}
diff --git a/src/main/java/oncoding/concoder/model/JpaBaseEntity.java b/src/main/java/oncoding/concoder/model/JpaBaseEntity.java
new file mode 100644
index 0000000..ab1b6d6
--- /dev/null
+++ b/src/main/java/oncoding/concoder/model/JpaBaseEntity.java
@@ -0,0 +1,15 @@
+package oncoding.concoder.model;
+
+import java.util.UUID;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+import javax.persistence.MappedSuperclass;
+import lombok.Getter;
+
+@Getter
+@MappedSuperclass
+public class JpaBaseEntity {
+    @Id
+    @GeneratedValue
+    private UUID id;
+}
diff --git a/src/main/java/oncoding/concoder/model/Level.java b/src/main/java/oncoding/concoder/model/Level.java
new file mode 100644
index 0000000..94cac7f
--- /dev/null
+++ b/src/main/java/oncoding/concoder/model/Level.java
@@ -0,0 +1,17 @@
+package oncoding.concoder.model;
+
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.validation.constraints.NotNull;
+import lombok.AccessLevel;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Getter
+@Entity
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+public class Level extends JpaBaseEntity {
+    @Column
+    @NotNull
+    private String name;
+}
diff --git a/src/main/java/oncoding/concoder/model/Problem.java b/src/main/java/oncoding/concoder/model/Problem.java
new file mode 100644
index 0000000..e6b02ad
--- /dev/null
+++ b/src/main/java/oncoding/concoder/model/Problem.java
@@ -0,0 +1,41 @@
+package oncoding.concoder.model;
+
+import java.util.ArrayList;
+import java.util.List;
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.FetchType;
+import javax.persistence.ManyToOne;
+import javax.persistence.OneToMany;
+import javax.validation.constraints.NotNull;
+
+import lombok.AccessLevel;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Getter
+@Entity
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+public class Problem extends JpaBaseEntity {
+    @Column(unique = true)
+    @NotNull
+    private Integer number;
+
+    @Column
+    @NotNull
+    private String title;
+
+    @Column
+    private Float rate;
+
+    @Column
+    @NotNull
+    private String content;
+
+    @ManyToOne(fetch = FetchType.EAGER)
+    private Level level;
+
+    @OneToMany(fetch = FetchType.EAGER, mappedBy = "problem")
+    private List<ProblemCategory> categories = new ArrayList<>();
+
+}
diff --git a/src/main/java/oncoding/concoder/model/ProblemCategory.java b/src/main/java/oncoding/concoder/model/ProblemCategory.java
new file mode 100644
index 0000000..38588c5
--- /dev/null
+++ b/src/main/java/oncoding/concoder/model/ProblemCategory.java
@@ -0,0 +1,18 @@
+package oncoding.concoder.model;
+
+import javax.persistence.Entity;
+import javax.persistence.ManyToOne;
+import lombok.AccessLevel;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Getter
+@Entity
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+public class ProblemCategory extends JpaBaseEntity {
+    @ManyToOne
+    private Problem problem;
+
+    @ManyToOne
+    private Category category;
+}
diff --git a/src/main/java/oncoding/concoder/repository/.gitkeep b/src/main/java/oncoding/concoder/repository/.gitkeep
deleted file mode 100644
index e69de29..0000000
diff --git a/src/main/java/oncoding/concoder/repository/CategoryRepository.java b/src/main/java/oncoding/concoder/repository/CategoryRepository.java
new file mode 100644
index 0000000..d53c55a
--- /dev/null
+++ b/src/main/java/oncoding/concoder/repository/CategoryRepository.java
@@ -0,0 +1,9 @@
+package oncoding.concoder.repository;
+
+import java.util.UUID;
+import oncoding.concoder.model.Category;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface CategoryRepository extends JpaRepository<Category, UUID> {
+
+}
diff --git a/src/main/java/oncoding/concoder/repository/LevelRepository.java b/src/main/java/oncoding/concoder/repository/LevelRepository.java
new file mode 100644
index 0000000..dca73e9
--- /dev/null
+++ b/src/main/java/oncoding/concoder/repository/LevelRepository.java
@@ -0,0 +1,9 @@
+package oncoding.concoder.repository;
+
+import java.util.UUID;
+import oncoding.concoder.model.Level;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface LevelRepository extends JpaRepository<Level, UUID> {
+
+}
diff --git a/src/main/java/oncoding/concoder/repository/ProblemCategoryRepository.java b/src/main/java/oncoding/concoder/repository/ProblemCategoryRepository.java
new file mode 100644
index 0000000..21501fb
--- /dev/null
+++ b/src/main/java/oncoding/concoder/repository/ProblemCategoryRepository.java
@@ -0,0 +1,9 @@
+package oncoding.concoder.repository;
+
+import java.util.UUID;
+import oncoding.concoder.model.ProblemCategory;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface ProblemCategoryRepository extends JpaRepository<ProblemCategory, UUID> {
+
+}
diff --git a/src/main/java/oncoding/concoder/repository/ProblemRepository.java b/src/main/java/oncoding/concoder/repository/ProblemRepository.java
new file mode 100644
index 0000000..b8a8fe5
--- /dev/null
+++ b/src/main/java/oncoding/concoder/repository/ProblemRepository.java
@@ -0,0 +1,9 @@
+package oncoding.concoder.repository;
+
+import java.util.UUID;
+import oncoding.concoder.model.Problem;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface ProblemRepository extends JpaRepository<Problem, UUID> {
+
+}