diff --git a/packages/api/prisma/migrations/20241202073949_alter_anon_flags/migration.sql b/packages/api/prisma/migrations/20241202073949_alter_anon_flags/migration.sql
new file mode 100644
index 00000000..c0721e15
--- /dev/null
+++ b/packages/api/prisma/migrations/20241202073949_alter_anon_flags/migration.sql
@@ -0,0 +1,9 @@
+/*
+  Warnings:
+
+  - You are about to drop the column `is_anon` on the `chat` table. All the data in the column will be lost.
+
+*/
+-- AlterTable
+ALTER TABLE `chat` DROP COLUMN `is_anon`,
+    MODIFY `type` ENUM('message', 'notice', 'anonymous', 'adminnotice') NOT NULL;
diff --git a/packages/api/prisma/schema.prisma b/packages/api/prisma/schema.prisma
index ec86d156..ae11108a 100644
--- a/packages/api/prisma/schema.prisma
+++ b/packages/api/prisma/schema.prisma
@@ -55,7 +55,6 @@ model Chat {
   message   String   @db.VarChar(500)
   createdAt DateTime @default(now()) @map("created_at")
   user      User     @relation(fields: [userId], references: [id])
-  isAnon    Boolean  @default(false) @map("is_anon")
 
   @@index([userId], map: "chat_user_id_fkey")
   @@map("chat")
@@ -127,6 +126,7 @@ model UserTag {
 enum ChatType {
   message
   notice
-
+  anonymous
+  adminnotice
   @@map("chat_type")
 }
diff --git a/packages/api/src/service/chat.ts b/packages/api/src/service/chat.ts
index 94491ac1..d29e2ec3 100644
--- a/packages/api/src/service/chat.ts
+++ b/packages/api/src/service/chat.ts
@@ -7,18 +7,10 @@ export const createMessage = async (
   { message, type }: schema.Send,
   user: User,
 ): Promise<schema.Message> => {
-  const isAnon = type === "anonymous";
-  const anonUser: User = {
-    id: 0,
-    isAdmin: false,
-    displayName: "익명",
-    username: "익명",
-  };
   const sendQuery: Prisma.ChatCreateInput = {
     user: { connect: user },
-    type: "message",
+    type,
     message,
-    isAnon,
     createdAt: new Date(),
   };
 
@@ -35,14 +27,16 @@ export const createMessage = async (
       type: true,
       message: true,
       createdAt: true,
-      isAnon: true,
     },
   });
 
-  if (isAnon) {
-    createdMessage.user = anonUser;
+  if (type === "anonymous") {
+    createdMessage.user.id = 0;
+    createdMessage.user.displayName = "익명";
   }
 
+  console.log(createdMessage);
+
   return {
     ...createdMessage,
     createdAt: createdAt.toISOString(),
@@ -101,20 +95,15 @@ export const retrieve = async ({
       type: true,
       message: true,
       createdAt: true,
-      isAnon: true,
     },
   });
 
-  const anonUser: User = {
-    id: 0,
-    isAdmin: false,
-    displayName: "익명",
-    username: "익명",
-  };
-
-  return messages.map(({ createdAt, isAnon, ...message }) => {
+  return messages.map(({ createdAt, ...message }) => {
     const displayMessage = message;
-    if (isAnon) displayMessage.user = anonUser;
+    if (message.type === "anonymous") {
+      displayMessage.user.id = 0;
+      displayMessage.user.displayName = "익명";
+    }
     return {
       ...displayMessage,
       createdAt: createdAt.toISOString(),