diff --git a/app/entities/post/detail/Callout.tsx b/app/entities/post/detail/Callout.tsx
new file mode 100644
index 0000000..5fdfb10
--- /dev/null
+++ b/app/entities/post/detail/Callout.tsx
@@ -0,0 +1,22 @@
+'use client';
+import { ReactNode } from 'react';
+
+interface CalloutProps {
+  emoji?: string;
+  children?: ReactNode;
+}
+
+const Callout = ({ emoji, children }: CalloutProps) => {
+  return (
+    <div className="flex gap-3 rounded-lg border border-neutral-200 dark:border-neutral-700 bg-neutral-100 dark:bg-neutral-800/60 px-4 py-3 my-4 not-prose">
+      {emoji && (
+        <span className="shrink-0 text-xl leading-7 select-none">{emoji}</span>
+      )}
+      <div className="min-w-0 flex-1 text-sm leading-7 text-neutral-800 dark:text-neutral-200 [&>p:last-child]:mb-0 [&>p]:mb-1">
+        {children}
+      </div>
+    </div>
+  );
+};
+
+export default Callout;
diff --git a/app/entities/post/detail/PostBody.tsx b/app/entities/post/detail/PostBody.tsx
index 6204292..455baf1 100644
--- a/app/entities/post/detail/PostBody.tsx
+++ b/app/entities/post/detail/PostBody.tsx
@@ -3,6 +3,7 @@ import { useState } from 'react';
 import LoadingIndicator from '@/app/entities/common/Loading/LoadingIndicator';
 import ImageZoomOverlayContainer from '@/app/entities/common/Overlay/Image/ImageZoomOverlayContainer';
 import Overlay from '@/app/entities/common/Overlay/Overlay';
+import Callout from '@/app/entities/post/detail/Callout';
 import OgLinkCard from '@/app/entities/post/detail/OgLinkCard';
 import PostTOC from '@/app/entities/post/detail/PostTOC';
 import TagBox from '@/app/entities/post/tags/TagBox';
@@ -10,7 +11,7 @@ import useOverlay from '@/app/hooks/common/useOverlay';
 import useTheme from '@/app/hooks/useTheme';
 import MDEditor from '@uiw/react-md-editor';
 import {
-  asideStyleRewrite,
+  asideToCallout,
   addDescriptionUnderImage,
   renderYoutubeEmbed,
   renderOpenGraph,
@@ -79,9 +80,11 @@ const PostBody = ({ content, tags, loading }: Props) => {
             components={{
               ogcard: ({ href }: { href?: string }) =>
                 href ? <OgLinkCard href={href} /> : null,
+              callout: ({ emoji, children }: { emoji?: string; children?: React.ReactNode }) =>
+                <Callout emoji={emoji}>{children}</Callout>,
             } as any}
             rehypeRewrite={(node, index?, parent?) => {
-              asideStyleRewrite(node);
+              asideToCallout(node);
               renderOpenGraph(node, index, parent as Element | undefined);
               renderYoutubeEmbed(
                 node,
diff --git a/app/entities/post/write/BlogForm.tsx b/app/entities/post/write/BlogForm.tsx
index 76efb49..3e94ad6 100644
--- a/app/entities/post/write/BlogForm.tsx
+++ b/app/entities/post/write/BlogForm.tsx
@@ -6,6 +6,7 @@ import { useSearchParams } from 'next/navigation';
 import { useEffect, useState } from 'react';
 import ImageZoomOverlayContainer from '@/app/entities/common/Overlay/Image/ImageZoomOverlayContainer';
 import Overlay from '@/app/entities/common/Overlay/Overlay';
+import Callout from '@/app/entities/post/detail/Callout';
 import DraftListOverlay from '@/app/entities/post/write/DraftListOverlay';
 import PostMetadataForm from '@/app/entities/post/write/PostMetadataForm';
 import PostWriteButtons from '@/app/entities/post/write/PostWriteButtons';
@@ -21,7 +22,7 @@ import usePost from '@/app/hooks/post/usePost';
 import useTheme from '@/app/hooks/useTheme';
 import useToast from '@/app/hooks/useToast';
 import {
-  asideStyleRewrite,
+  asideToCallout,
   addDescriptionUnderImage,
   renderYoutubeEmbed,
   createImageClickHandler,
@@ -289,8 +290,12 @@ const BlogForm = () => {
             wrapperElement: {
               'data-color-mode': theme,
             },
+            components: {
+              callout: ({ emoji, children }: { emoji?: string; children?: React.ReactNode }) =>
+                <Callout emoji={emoji}>{children}</Callout>,
+            } as any,
             rehypeRewrite: (node, index?, parent?) => {
-              asideStyleRewrite(node);
+              asideToCallout(node);
               renderYoutubeEmbed(
                 node,
                 index || 0,
diff --git a/app/lib/utils/rehypeUtils.ts b/app/lib/utils/rehypeUtils.ts
index f9cede1..b27bb2c 100644
--- a/app/lib/utils/rehypeUtils.ts
+++ b/app/lib/utils/rehypeUtils.ts
@@ -5,27 +5,21 @@
 import { SelectedImage } from '../../entities/post/detail/PostBody';
 
 /**
- * aside 태그의 첫 번째 텍스트 노드를 emoji span으로 래핑
+ * aside 태그를 callout 커스텀 컴포넌트 노드로 변환
+ * 첫 번째 텍스트 노드를 emoji prop으로 추출하고 나머지는 children으로 유지
  */
-export const asideStyleRewrite = (node: any) => {
+export const asideToCallout = (node: any) => {
   if (node.type === 'element' && node.tagName === 'aside') {
-    for (const child of [...node.children]) {
-      if (node.children[0] === child && child.type === 'text') {
-        node.children[0] = {
-          type: 'element',
-          tagName: 'span',
-          properties: {
-            className: 'aside-emoji',
-          },
-          children: [
-            {
-              type: 'text',
-              value: child.value!,
-            },
-          ],
-        };
-      }
+    const firstChild = node.children[0];
+    let emoji = '';
+
+    if (firstChild?.type === 'text') {
+      emoji = firstChild.value.trim();
+      node.children = node.children.slice(1);
     }
+
+    node.tagName = 'callout';
+    node.properties = { ...node.properties, emoji };
   }
 };