diff --git a/servers/mumu/src/github/comment.ts b/servers/mumu/src/github/comment.ts
index 0c1f203..e095e58 100644
--- a/servers/mumu/src/github/comment.ts
+++ b/servers/mumu/src/github/comment.ts
@@ -1,7 +1,7 @@
 import { redisStorage } from "../redis";
 import type { SlackNotifier } from "../slack";
 import type { SlackThread } from "../types";
-import type { PullRequestReviewComment } from "./schema";
+import type { Comment } from "./schema";
 
 const MAX_CHARS = 200;
 
@@ -14,18 +14,31 @@ const truncateBody = (body: string): string => {
 const escapeSlackLinkText = (text: string): string =>
   text.replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;").replace(/"/g, "&quot;");
 
-export const handlePullRequestReviewComment = async (
-  payload: PullRequestReviewComment,
-  slackNotifier: SlackNotifier,
-) => {
+function buildCommentMessage(payload: Comment): string {
+  const preview = truncateBody(payload.comment.body);
+  const safePreview = escapeSlackLinkText(preview);
+
+  return [`> *${payload.comment.user.login}*`, `> <${payload.comment.html_url}|${safePreview}>`].join("\n");
+}
+
+export const handleComment = async (payload: Comment, slackNotifier: SlackNotifier): Promise<string> => {
   if (payload.action !== "created") {
-    return JSON.stringify({ success: false, message: "Review comment action skipped." });
+    return JSON.stringify({ success: false, message: "Comment action skipped." });
   }
 
   const repoFullName = payload.repository.full_name;
-  const prNumber = payload.pull_request.number;
-  const cacheKey = `${repoFullName}#${prNumber}`;
+  let prNumber: number;
+
+  if ("issue" in payload) {
+    if (!payload.issue.pull_request) {
+      return JSON.stringify({ success: false, message: "Issue comment (not PR); skipped." });
+    }
+    prNumber = payload.issue.number;
+  } else {
+    prNumber = payload.pull_request.number;
+  }
 
+  const cacheKey = `${repoFullName}#${prNumber}`;
   const thread = await redisStorage.get<SlackThread>(cacheKey);
 
   if (!thread?.threadTs) {
@@ -35,15 +48,14 @@ export const handlePullRequestReviewComment = async (
     });
   }
 
-  const preview = truncateBody(payload.comment.body);
-  const safePreview = escapeSlackLinkText(preview);
-  const text = [`> *${payload.comment.user.login}*`, `> <${payload.comment.html_url}|${safePreview}>`].join("\n");
+  const text = buildCommentMessage(payload);
 
   try {
     await slackNotifier.createThreadReply(thread.threadTs, text);
   } catch {
-    console.error(`${cacheKey}/${thread.channel}: review comment 슬랙 스레드 답변 전송 실패`);
+    console.error(`${cacheKey}/${thread.channel}: 슬랙 스레드 답변 전송 실패`);
+    return JSON.stringify({ success: false, message: "Slack thread reply failed" });
   }
 
-  return JSON.stringify({ success: true, message: "Review comment processed successfully" });
+  return JSON.stringify({ success: true, message: "Comment processed successfully" });
 };
diff --git a/servers/mumu/src/github/schema.ts b/servers/mumu/src/github/schema.ts
index 9d2e2c9..c9a458c 100644
--- a/servers/mumu/src/github/schema.ts
+++ b/servers/mumu/src/github/schema.ts
@@ -2,6 +2,9 @@ import { z } from "zod";
 
 export type PullRequest = z.infer<typeof pullRequestSchema>;
 export type PullRequestReviewComment = z.infer<typeof pullRequestReviewCommentSchema>;
+export type IssueComment = z.infer<typeof issueCommentSchema>;
+
+export type Comment = z.infer<typeof commentSchema>;
 
 export const pullRequestSchema = z.object({
   action: z.string(),
@@ -44,3 +47,19 @@ export const pullRequestReviewCommentSchema = z.object({
   }),
   repository: z.object({ full_name: z.string() }),
 });
+
+export const issueCommentSchema = z.object({
+  action: z.enum(["created", "edited", "deleted"]),
+  issue: z.object({
+    number: z.number(),
+    pull_request: z.looseObject({}).optional(),
+  }),
+  comment: z.object({
+    body: z.string(),
+    html_url: z.string(),
+    user: z.object({ login: z.string() }),
+  }),
+  repository: z.object({ full_name: z.string() }),
+});
+
+export const commentSchema = z.union([pullRequestReviewCommentSchema, issueCommentSchema]);
diff --git a/servers/mumu/src/webhook.ts b/servers/mumu/src/webhook.ts
index b4240b1..64f9f67 100644
--- a/servers/mumu/src/webhook.ts
+++ b/servers/mumu/src/webhook.ts
@@ -1,10 +1,10 @@
 import { Router, type Request, type Response } from "express";
 import { createSlackNotifier } from "./slack";
 import { assertNonNullish } from "./utils/assert";
-import { pullRequestSchema, pullRequestReviewCommentSchema } from "./github/schema";
+import { pullRequestSchema, commentSchema } from "./github/schema";
 import { FRONTEND_BOT_CHANNEL } from "./constant";
 import { handlePullRequest } from "./github/pull_request";
-import { handlePullRequestReviewComment } from "./github/comment";
+import { handleComment } from "./github/comment";
 import { isValidRepository } from "./config";
 
 export function createWebhookRouter(): Router {
@@ -37,10 +37,9 @@ export function createWebhookRouter(): Router {
           handlePullRequest(pullRequestSchema.parse(req.body), slackNotifier).then((res) => console.log(res));
           break;
         }
-        case "pull_request_review_comment": {
-          handlePullRequestReviewComment(pullRequestReviewCommentSchema.parse(req.body), slackNotifier).then((res) =>
-            console.log(res),
-          );
+        case "pull_request_review_comment":
+        case "issue_comment": {
+          handleComment(commentSchema.parse(req.body), slackNotifier).then((res) => console.log(res));
           break;
         }
       }