diff --git a/OpenUtau.Core/KoreanPhonemizerUtil.cs b/OpenUtau.Core/KoreanPhonemizerUtil.cs
index 5f91af913..a08236b83 100644
--- a/OpenUtau.Core/KoreanPhonemizerUtil.cs
+++ b/OpenUtau.Core/KoreanPhonemizerUtil.cs
@@ -8,7 +8,6 @@
 using OpenUtau.Classic;
 using Serilog;
 using static OpenUtau.Api.Phonemizer;
-using OpenUtau.Api;
 
 namespace OpenUtau.Core {
     /// <summary>
@@ -372,7 +371,7 @@ private static Hashtable Variate(Hashtable firstCharSeparated, Hashtable nextCha
                 nextFirstConsonant = "ㅇ";
             }
 
-            if ((!firstLastConsonant.Equals("")) && nextFirstConsonant.Equals("ㅇ") && (!firstLastConsonant.Equals("ㅇ"))) {
+            if ((!firstLastConsonant.Equals(" ")) && nextFirstConsonant.Equals("ㅇ") && (!firstLastConsonant.Equals("ㅇ"))) {
                 // 연음 2
                 nextFirstConsonant = firstLastConsonant;
                 firstLastConsonant = " ";
diff --git a/OpenUtau.Plugin.Builtin/KoreanCBNNPhonemizer.cs b/OpenUtau.Plugin.Builtin/KoreanCBNNPhonemizer.cs
index 0ee400ff3..008f86847 100644
--- a/OpenUtau.Plugin.Builtin/KoreanCBNNPhonemizer.cs
+++ b/OpenUtau.Plugin.Builtin/KoreanCBNNPhonemizer.cs
@@ -141,11 +141,11 @@ private Result ConvertForCBNN(Note[] notes, string[] prevLyric, string[] thisLyr
             }
             string frontCV;
             string batchim;
-            string VC = $"{thisMidVowelTail} {FIRST_CONSONANTS[nextLyric[0]]}";
+            string VC = $"{thisMidVowelTail} {FIRST_CONSONANTS[nextLyric[0]]}{MIDDLE_VOWELS[nextLyric[1]][1]}";
             string VV = $"{MIDDLE_VOWELS[prevLyric[1]][2]} {thisMidVowelTail}";
             string VSv = $"{thisMidVowelTail} {MIDDLE_VOWELS[nextLyric[1]][1]}";
             isItNeedsVSv = thisLyric[2] == " " && nextLyric[0] == "ㅇ" && !PLAIN_VOWELS.Contains(nextLyric[1]) && FindInOto(VSv, note, true) != null;
-            isItNeedsVC = thisLyric[2] == " " && nextLyric[0] != "ㅇ" && nextLyric[0] != "null" && FindInOto(VC, note, true) != null;
+            isItNeedsVC = thisLyric[2] == " " && nextLyric[0] != "ㅇ" && nextLyric[0] != "null";
 
             frontCV = $"- {CV}";
             if (FindInOto(frontCV, note, true) == null) {
@@ -155,6 +155,15 @@ private Result ConvertForCBNN(Note[] notes, string[] prevLyric, string[] thisLyr
                 }
             }
 
+            if (FindInOto(VC, note, true) == null) {
+                if (VC.EndsWith("w") || VC.EndsWith("y")) {
+                    VC = VC.Substring(0, VC.Length - 1);
+                }
+                if (FindInOto(VC, note, true) == null) {
+                    isItNeedsVC = false;
+                }
+            }
+
             if (isItNeedsVV) {CV = VV;}
         
 
@@ -214,26 +223,22 @@ private Result ConvertForCBNN(Note[] notes, string[] prevLyric, string[] thisLyr
         }
 
 
-        private string HandleEmptyFirstConsonant(string lyric) {
-            return lyric == " " ? "ㅇ" : lyric;
-        }
-
         public override Result ConvertPhonemes(Note[] notes, Note? prev, Note? next, Note? prevNeighbour, Note? nextNeighbour, Note[] prevNeighbours) {
             Note note = notes[0];
 
             Hashtable lyrics = KoreanPhonemizerUtil.Variate(prevNeighbour, note, nextNeighbour);
             string[] prevLyric = new string[]{ // "ㄴ", "ㅑ", "ㅇ"
-                HandleEmptyFirstConsonant((string)lyrics[0]), 
+                (string)lyrics[0], 
                 (string)lyrics[1], 
                 (string)lyrics[2]
                 };
             string[] thisLyric = new string[]{ // "ㄴ", "ㅑ", "ㅇ"
-                HandleEmptyFirstConsonant((string)lyrics[3]), 
+                (string)lyrics[3], 
                 (string)lyrics[4], 
                 (string)lyrics[5]
                 };
             string[] nextLyric = new string[]{ // "ㄴ", "ㅑ", "ㅇ"
-                HandleEmptyFirstConsonant((string)lyrics[6]), 
+                (string)lyrics[6], 
                 (string)lyrics[7], 
                 (string)lyrics[8]
                 };
@@ -257,7 +262,7 @@ public override Result GenerateEndSound(Note[] notes, Note? prev, Note? next, No
             Hashtable lyrics = KoreanPhonemizerUtil.Separate(prevNeighbour_.lyric);
 
             string[] prevLyric = new string[]{ // "ㄴ", "ㅑ", "ㅇ"
-                HandleEmptyFirstConsonant((string)lyrics[0]), 
+                (string)lyrics[0], 
                 (string)lyrics[1], 
                 (string)lyrics[2]
                 };
diff --git a/OpenUtau.Plugin.Builtin/KoreanCVPhonemizer.cs b/OpenUtau.Plugin.Builtin/KoreanCVPhonemizer.cs
index 2e77ff344..9713aed06 100644
--- a/OpenUtau.Plugin.Builtin/KoreanCVPhonemizer.cs
+++ b/OpenUtau.Plugin.Builtin/KoreanCVPhonemizer.cs
@@ -232,26 +232,22 @@ private Result ConvertForCV(Note[] notes, string[] prevLyric, string[] thisLyric
         }
 
 
-        private string HandleEmptyFirstConsonant(string lyric) {
-            return lyric == " " ? "ㅇ" : lyric;
-        }
-
         public override Result ConvertPhonemes(Note[] notes, Note? prev, Note? next, Note? prevNeighbour, Note? nextNeighbour, Note[] prevNeighbours) {
             Note note = notes[0];
 
             Hashtable lyrics = KoreanPhonemizerUtil.Variate(prevNeighbour, note, nextNeighbour);
             string[] prevLyric = new string[]{ // "ㄴ", "ㅑ", "ㅇ"
-                HandleEmptyFirstConsonant((string)lyrics[0]), 
+                (string)lyrics[0], 
                 (string)lyrics[1], 
                 (string)lyrics[2]
                 };
             string[] thisLyric = new string[]{ // "ㄴ", "ㅑ", "ㅇ"
-                HandleEmptyFirstConsonant((string)lyrics[3]), 
+                (string)lyrics[3], 
                 (string)lyrics[4], 
                 (string)lyrics[5]
                 };
             string[] nextLyric = new string[]{ // "ㄴ", "ㅑ", "ㅇ"
-                HandleEmptyFirstConsonant((string)lyrics[6]), 
+                (string)lyrics[6], 
                 (string)lyrics[7], 
                 (string)lyrics[8]
                 };
@@ -275,7 +271,7 @@ public override Result GenerateEndSound(Note[] notes, Note? prev, Note? next, No
             Hashtable lyrics = KoreanPhonemizerUtil.Separate(prevNeighbour_.lyric);
 
             string[] prevLyric = new string[]{ // "ㄴ", "ㅑ", "ㅇ"
-                HandleEmptyFirstConsonant((string)lyrics[0]), 
+                (string)lyrics[0], 
                 (string)lyrics[1], 
                 (string)lyrics[2]
                 };