diff --git a/src/hangul/unicode/hangulPattern.js b/src/hangul/unicode/hangulPattern.js
index 712fb57..6f957de 100644
--- a/src/hangul/unicode/hangulPattern.js
+++ b/src/hangul/unicode/hangulPattern.js
@@ -1 +1,5 @@
-module.exports = /[\uac00-\ud7af\u1100-\u11ff\u3130-\u318f\ua960-\ua97f\ud7b0-\ud7ff]+/g
+const hangulPattern = /[\uac00-\ud7af\u1100-\u11ff\u3130-\u318f\ua960-\ua97f\ud7b0-\ud7ff]+/g
+
+const splitPattern = /([\uac00-\ud7af\u1100-\u11ff\u3130-\u318f\ua960-\ua97f\ud7b0-\ud7ff]+|[^\uac00-\ud7af\u1100-\u11ff\u3130-\u318f\ua960-\ua97f\ud7b0-\ud7ff]+)/
+
+module.exports = { hangulPattern, splitPattern }
diff --git a/src/hangul/unicode/hangulPattern.test.js b/src/hangul/unicode/hangulPattern.test.js
index 26a6d46..c46dc29 100644
--- a/src/hangul/unicode/hangulPattern.test.js
+++ b/src/hangul/unicode/hangulPattern.test.js
@@ -1,4 +1,4 @@
-const hangulPattern = require('./hangulPattern')
+const { hangulPattern } = require('./hangulPattern')
 const HANGUL_BLOCKS = Object.entries(require('./blocks')).filter(
   ([blockName]) => blockName.startsWith('HANGUL')
 )
diff --git a/src/index.js b/src/index.js
index 99f2a6d..8253949 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,12 +1,3 @@
-const hangulPattern = require('./hangul/unicode/hangulPattern')
-const { romanizeWord } = require('./romanize')
+const { romanize, romanizeWord } = require('./romanize')
 
-/**
- * Transforms a given string by replacing each Hangul character-containing substring with romaja
- * @param {string} text
- * @param {Object} [options]
- */
-const romanize = (text, options) =>
-  text.replace(hangulPattern, word => romanizeWord(word, options))
-
-module.exports = { romanize }
+module.exports = { romanize, romanizeWord }
diff --git a/src/romanize.js b/src/romanize.js
index 304d91f..3782b2b 100644
--- a/src/romanize.js
+++ b/src/romanize.js
@@ -1,5 +1,28 @@
+const {
+  hangulPattern,
+  splitPattern
+} = require('./hangul/unicode/hangulPattern')
 const { decomposeHangul } = require('./hangul/unicode/decompose')
 const { syllableParser } = require('./syllableParser')
+const isHangul = require('./hangul/isHangul')
+
+/**
+ * Transforms a given string by replacing each Hangul character-containing substring with romaja
+ * @param {string} text
+ * @param {Object} [options]
+ * @param {boolean} [ruby]
+ */
+const romanize = (text, options = {}) => {
+  if (options.ruby) {
+    return text.split(splitPattern).map(str => {
+      if (isHangul(str[0])) {
+        return { text: romanizeWord(str), ruby: str }
+      }
+      return str
+    })
+  }
+  return text.replace(hangulPattern, word => romanizeWord(word, options))
+}
 
 /**
  * Transform a Hangul encoded string to Roman equivalent
@@ -28,4 +51,4 @@ function romanizeWord (word, options = {}) {
     : mappedToRoman.replace(/-$/, '')
 }
 
-module.exports = { romanizeWord }
+module.exports = { romanize, romanizeWord }