diff --git a/src/VerseValidator.jsx b/src/VerseValidator.jsx
index 378498a..03dce78 100644
--- a/src/VerseValidator.jsx
+++ b/src/VerseValidator.jsx
@@ -1,6 +1,7 @@
 import { useState } from "react";
 import "./VerseValidator.css";
 import { StringDiff } from "react-string-diff";
+import { containsKorean, jamoSubstringMatch } from './jamoUtils';
 
 const STATE = {
   INCORRECT: 0,
@@ -21,13 +22,38 @@ const VerseValidator = ({ element: { pack, title, chapterTitle, reference, verse
   const [verseBool, setVerseBool] = useState(STATE.INCORRECT)
   const[hintBool, setHintBool] = useState(false)
   const[diffBool, setDiffBool] = useState(false)
- const [isComposing, setIsComposing] = useState(false);
+  const [isComposing, setIsComposing] = useState(false);
+
+
 
   // Handle the start of composition
   const handleCompositionStart = () => {
     setIsComposing(true);
   };
 
+  function resultChecker(string1, string2) {
+    var result = STATE.INCORRECT; // init
+    // contains korean
+    if (containsKorean(string1)) {
+      if (string1 === string2) {
+        result = STATE.CORRECT;
+      } else if (jamoSubstringMatch(string2, string1) & string1 !== "") {
+        result = STATE.PARTIAL;
+      } else {
+        result = STATE.INCORRECT;
+      }
+    } else { // does not contain korean
+      if (string1 === string2) {
+        result = STATE.CORRECT;
+      } else if (string2.startsWith(string1) & string1 !== "") {
+        result = STATE.PARTIAL;
+      } else {
+        result = STATE.INCORRECT;
+      }
+    }
+    return result;
+
+  }
 
   // function to check correctness of reference input
   const referenceChange = (e) => {
@@ -40,14 +66,8 @@ const VerseValidator = ({ element: { pack, title, chapterTitle, reference, verse
       .replace(/\s+/g, "")
       .toLowerCase()
       .normalize("NFC");
-    var result = STATE.INCORRECT; // init
-    if (string1 === string2) {
-      result = STATE.CORRECT;
-    } else if (string2.startsWith(string1) & string1 !== "") {
-      result = STATE.PARTIAL
-    } else {
-      result = STATE.INCORRECT
-    }
+    
+    const result = resultChecker(string1, string2);
 
     setReference(value);
     setReferenceBool(result);
@@ -79,14 +99,9 @@ const VerseValidator = ({ element: { pack, title, chapterTitle, reference, verse
       .toLowerCase()
       .normalize("NFC");
 
-    var result = STATE.INCORRECT; // init
-    if (string1 === string2) {
-      result = STATE.CORRECT;
-    } else if (string2.startsWith(string1) & string1 !== "") {
-      result = STATE.PARTIAL
-    } else {
-      result = STATE.INCORRECT
-    }
+
+    const result = resultChecker(string1, string2);
+
 
     setTitle(value);
     setTitleBool(result);
@@ -118,14 +133,7 @@ const VerseValidator = ({ element: { pack, title, chapterTitle, reference, verse
       .toLowerCase()
       .normalize("NFC");
 
-    var result = STATE.INCORRECT; // init
-    if (string1 === string2) {
-      result = STATE.CORRECT;
-    } else if (string2.startsWith(string1) & string1 !== "") {
-      result = STATE.PARTIAL
-    } else {
-      result = STATE.INCORRECT
-    }
+    const result = resultChecker(string1, string2);
 
     setChapterTitle(value);
     setChapterTitleBool(result);
@@ -153,14 +161,7 @@ const VerseValidator = ({ element: { pack, title, chapterTitle, reference, verse
       .toLowerCase()
       .normalize("NFC");
 
-    var result = STATE.INCORRECT; // init
-    if (string1 === string2) {
-      result = STATE.CORRECT;
-    } else if (string2.startsWith(string1) & string1 !== "") {
-      result = STATE.PARTIAL
-    } else {
-      result = STATE.INCORRECT
-    }
+    const result = resultChecker(string1, string2);
 
     setVerse(value);
     setVerseBool(result);
@@ -215,15 +216,11 @@ const VerseValidator = ({ element: { pack, title, chapterTitle, reference, verse
             id="referenceBox"
             name="referenceBox"
             onChange={(event) => {
+              
               if (!isComposing) {
                 referenceChange(event);
               }
             }}
-            onCompositionStart={handleCompositionStart}
-            onCompositionEnd={(event) => {
-              setIsComposing(false);
-              referenceChange(event);
-            }}
           />
         </div>
       ) : (
diff --git a/src/jamoUtils.js b/src/jamoUtils.js
new file mode 100644
index 0000000..add1d49
--- /dev/null
+++ b/src/jamoUtils.js
@@ -0,0 +1,84 @@
+const BASE_CODE = 44032;
+const CHO = 588;
+const JUNG = 28;
+
+const cho = ["ㄱ", "ㄲ", "ㄴ", "ㄷ", "ㄸ", "ㄹ", "ㅁ", "ㅂ", "ㅃ", "ㅅ", "ㅆ", "ㅇ", "ㅈ", "ㅉ", "ㅊ", "ㅋ", "ㅌ", "ㅍ", "ㅎ"];
+const jung = ["ㅏ", "ㅐ", "ㅑ", "ㅒ", "ㅓ", "ㅔ", "ㅕ", "ㅖ", "ㅗ", "ㅘ", "ㅙ", "ㅚ", "ㅛ", "ㅜ", "ㅝ", "ㅞ", "ㅟ", "ㅠ", "ㅡ", "ㅢ", "ㅣ"];
+const jong = ["", "ㄱ", "ㄲ", "ㄳ", "ㄴ", "ㄵ", "ㄶ", "ㄷ", "ㄹ", "ㄺ", "ㄻ", "ㄼ", "ㄽ", "ㄾ", "ㄿ", "ㅀ", "ㅁ", "ㅂ", "ㅄ", "ㅅ", "ㅆ", "ㅇ", "ㅈ", "ㅊ", "ㅋ", "ㅌ", "ㅍ", "ㅎ"];
+
+// Decompose the medial vowel into individual components, if necessary
+const jungSplit = {
+  "ㅘ": ["ㅗ", "ㅏ"],
+  "ㅙ": ["ㅗ", "ㅐ"],
+  "ㅚ": ["ㅗ", "ㅣ"],
+  "ㅝ": ["ㅜ", "ㅓ"],
+  "ㅞ": ["ㅜ", "ㅔ"],
+  "ㅟ": ["ㅜ", "ㅣ"],
+  "ㅢ": ["ㅡ", "ㅣ"],
+};
+
+// decompose ending consonents
+const jongSplit = {
+  "ㄲ": ["ㄱ", "ㄱ"],
+  "ㄳ": ["ㄱ", "ㅅ"],
+  "ㄵ": ["ㄴ", "ㅈ"],
+  "ㄶ": ["ㄴ", "ㅎ"],
+  "ㄺ": ["ㄹ", "ㄱ"],
+  "ㄻ": ["ㄹ", "ㅁ"],
+  "ㄼ": ["ㄹ", "ㅂ"],
+  "ㄽ": ["ㄹ", "ㅅ"],
+  "ㄾ": ["ㄹ", "ㅌ"],
+  "ㄿ": ["ㄹ", "ㅍ"],
+  "ㅀ": ["ㄹ", "ㅎ"],
+  "ㅄ": ["ㅂ", "ㅅ"],
+  "ㅆ": ["ㅅ", "ㅅ"],
+}
+
+export function decomposeHangul(character) {
+  const code = character.charCodeAt(0) - BASE_CODE;
+  
+  if (code < 0 || code > 11171) {
+    // Return character as is if it's not a Hangul syllable
+    return character;
+  }
+
+  const choIndex = Math.floor(code / CHO);
+  const jungIndex = Math.floor((code - (choIndex * CHO)) / JUNG);
+  const jongIndex = code % JUNG;
+
+  // Decompose cho, jung, and jong
+  const choJamo = cho[choIndex];
+  const jungJamo = jung[jungIndex];
+  const jongJamo = jong[jongIndex];
+
+  // Handle double jamo in jung
+  const jungComponents = jungSplit[jungJamo] || [jungJamo];
+
+
+  // handle double jamo in jong
+  const jongComponents = jongSplit[jongJamo] || [jongJamo];
+
+  return [choJamo, ...jungComponents, ...jongComponents].join('');
+}
+
+export function decomposeStringToJamo(inputString) {
+  return inputString.split('').map(decomposeHangul).join('');
+}
+
+export function jamoSubstringMatch(mainString, substring) {
+  const decomposedMain = decomposeStringToJamo(mainString)
+      .replace(/\s+/g, "");
+  const decomposedSub = decomposeStringToJamo(substring)
+      .replace(/\s+/g, "");
+  
+  return decomposedMain.startsWith(decomposedSub);
+}
+
+// Unicode Ranges for Korean Characters:
+//     Hangul Syllables: \uAC00-\uD7A3
+//     Hangul Jamo: \u1100-\u11FF (for initial consonants, vowels, and final consonants)
+//     Hangul Compatibility Jamo: \u3130-\u318F
+export function containsKorean(text) {
+  const koreanRegex = /[\u1100-\u11FF\u3130-\u318F\uAC00-\uD7A3]/;
+  return koreanRegex.test(text);
+}
\ No newline at end of file