diff --git a/packages/utils/saferKorean.ts b/packages/utils/saferKorean.ts
index 75dfa1d..36a2d26 100644
--- a/packages/utils/saferKorean.ts
+++ b/packages/utils/saferKorean.ts
@@ -21,6 +21,14 @@ export function processUnsounds(input: string): string {
 
 // Process mistype like 'zㅋㅋㅋㅋ' => "ㅋㅋㅋㅋㅋ"
 export function processMistype(input: string): string {
+  const trimContent = input.trim();
+
+  if (trimContent == "dz") {
+    return "ㅇㅋ";
+  } else if (trimContent == "dd") {
+    return "ㅇㅇ";
+  }
+
   return input.replace(
     /(z+)(ㅋ+)/g,
     (_, z: string, tail) => "ㅋ".repeat(z.length) + tail,