diff --git a/app/Http/Controllers/Admin/MemberNoteController.php b/app/Http/Controllers/Admin/MemberNoteController.php
index d664883..efd291a 100644
--- a/app/Http/Controllers/Admin/MemberNoteController.php
+++ b/app/Http/Controllers/Admin/MemberNoteController.php
@@ -15,7 +15,7 @@ class MemberNoteController extends Controller
      */
     public function index(Member $member)
     {
-        $notes = $member->notes()->with('author')->get();
+        $notes = $member->notes()->with('author:id,name')->latest('created_at')->get();
 
         return response()->json(['notes' => $notes]);
     }
diff --git a/package-lock.json b/package-lock.json
index 130093d..7857184 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,6 +4,9 @@
     "requires": true,
     "packages": {
         "": {
+            "dependencies": {
+                "@alpinejs/collapse": "^3.15.8"
+            },
             "devDependencies": {
                 "@tailwindcss/forms": "^0.5.2",
                 "alpinejs": "^3.4.2",
@@ -28,6 +31,12 @@
                 "url": "https://github.com/sponsors/sindresorhus"
             }
         },
+        "node_modules/@alpinejs/collapse": {
+            "version": "3.15.8",
+            "resolved": "https://registry.npmjs.org/@alpinejs/collapse/-/collapse-3.15.8.tgz",
+            "integrity": "sha512-zZhD8DHdHuzGFe8+cHNH99K//oFutzKwcy6vagydb3KFlTzmqxTnHZo5sSV81lAazhV7qKsYCKtNV14tR9QkJw==",
+            "license": "MIT"
+        },
         "node_modules/@esbuild/aix-ppc64": {
             "version": "0.21.5",
             "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.21.5.tgz",
diff --git a/package.json b/package.json
index 31208d1..5209566 100644
--- a/package.json
+++ b/package.json
@@ -14,5 +14,8 @@
         "postcss": "^8.4.31",
         "tailwindcss": "^3.1.0",
         "vite": "^5.0.0"
+    },
+    "dependencies": {
+        "@alpinejs/collapse": "^3.15.8"
     }
 }
diff --git a/resources/js/app.js b/resources/js/app.js
index a8093be..fb7bf52 100644
--- a/resources/js/app.js
+++ b/resources/js/app.js
@@ -1,7 +1,9 @@
 import './bootstrap';
 
 import Alpine from 'alpinejs';
+import collapse from '@alpinejs/collapse';
 
+Alpine.plugin(collapse);
 window.Alpine = Alpine;
 
 Alpine.start();
diff --git a/resources/views/admin/members/index.blade.php b/resources/views/admin/members/index.blade.php
index 152347e..0f35e49 100644
--- a/resources/views/admin/members/index.blade.php
+++ b/resources/views/admin/members/index.blade.php
@@ -193,22 +193,30 @@
                             </thead>
                             <tbody class="divide-y divide-gray-200 dark:divide-gray-700 bg-white dark:bg-gray-800">
                                 @forelse ($members as $member)
-                                    <tr x-data="{
+                                    <template x-data="{
     noteFormOpen: false,
     noteContent: '',
     isSubmitting: false,
     errors: {},
     noteCount: {{ $member->notes_count ?? 0 }},
+    historyOpen: false,
+    notes: [],
+    notesLoaded: false,
+    isLoadingNotes: false,
+    searchQuery: '',
     async submitNote() {
         this.isSubmitting = true;
         this.errors = {};
         try {
-            await axios.post('{{ route('admin.members.notes.store', $member) }}', {
+            const response = await axios.post('{{ route('admin.members.notes.store', $member) }}', {
                 content: this.noteContent
             });
             this.noteCount++;
             this.noteContent = '';
             this.noteFormOpen = false;
+            if (this.notesLoaded) {
+                this.notes.unshift(response.data.note);
+            }
         } catch (error) {
             if (error.response && error.response.status === 422) {
                 this.errors = error.response.data.errors || {};
@@ -216,8 +224,47 @@
         } finally {
             this.isSubmitting = false;
         }
+    },
+    toggleHistory() {
+        this.historyOpen = !this.historyOpen;
+        if (!this.historyOpen) {
+            this.searchQuery = '';
+        }
+        if (this.historyOpen && !this.notesLoaded) {
+            this.loadNotes();
+        }
+    },
+    async loadNotes() {
+        this.isLoadingNotes = true;
+        try {
+            const response = await axios.get('{{ route("admin.members.notes.index", $member) }}');
+            this.notes = response.data.notes;
+            this.notesLoaded = true;
+        } catch (error) {
+            console.error('Failed to load notes:', error);
+        } finally {
+            this.isLoadingNotes = false;
+        }
+    },
+    get filteredNotes() {
+        if (!this.searchQuery.trim()) return this.notes;
+        const query = this.searchQuery.toLowerCase();
+        return this.notes.filter(note =>
+            note.content.toLowerCase().includes(query) ||
+            note.author.name.toLowerCase().includes(query)
+        );
+    },
+    formatDateTime(dateString) {
+        const date = new Date(dateString);
+        const year = date.getFullYear();
+        const month = String(date.getMonth() + 1).padStart(2, '0');
+        const day = String(date.getDate()).padStart(2, '0');
+        const hours = String(date.getHours()).padStart(2, '0');
+        const minutes = String(date.getMinutes()).padStart(2, '0');
+        return year + '年' + month + '月' + day + '日 ' + hours + ':' + minutes;
     }
 }">
+                                        <tr>
                                         <td class="px-4 py-3">
                                             <input type="checkbox" name="selected_ids[]" value="{{ $member->id }}" class="member-checkbox rounded border-gray-300 dark:border-gray-600 text-indigo-600 shadow-sm focus:ring-indigo-500 dark:focus:ring-indigo-600 dark:bg-gray-700">
                                         </td>
@@ -255,9 +302,13 @@
                                         <td class="px-4 py-3 text-sm">
                                             <div class="flex items-center gap-2">
                                                 <!-- Note count badge -->
-                                                <span class="inline-flex items-center rounded-full px-2 py-0.5 text-xs font-medium bg-blue-100 dark:bg-blue-900 text-blue-800 dark:text-blue-200">
+                                                <button @click="toggleHistory()"
+                                                        type="button"
+                                                        :aria-expanded="historyOpen.toString()"
+                                                        :aria-controls="'notes-panel-{{ $member->id }}'"
+                                                        class="inline-flex items-center rounded-full px-2 py-0.5 text-xs font-medium bg-blue-100 dark:bg-blue-900 text-blue-800 dark:text-blue-200 hover:bg-blue-200 dark:hover:bg-blue-800 cursor-pointer transition-colors">
                                                     <span x-text="noteCount"></span>
-                                                </span>
+                                                </button>
                                                 <!-- Toggle button -->
                                                 <button
                                                     @click="noteFormOpen = !noteFormOpen"
@@ -312,6 +363,61 @@
                                             </a>
                                         </td>
                                     </tr>
+                                    <!-- Expansion panel row -->
+                                    <tr x-show="historyOpen" x-collapse
+                                        :id="'notes-panel-{{ $member->id }}'"
+                                        class="bg-gray-50 dark:bg-gray-900">
+                                        <td colspan="8" class="px-6 py-4">
+                                            <!-- Loading state -->
+                                            <div x-show="isLoadingNotes" class="flex justify-center py-4">
+                                                <svg class="animate-spin h-5 w-5 text-gray-400" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24">
+                                                    <circle class="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" stroke-width="4"></circle>
+                                                    <path class="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"></path>
+                                                </svg>
+                                                <span class="ml-2 text-sm text-gray-500 dark:text-gray-400">載入中...</span>
+                                            </div>
+
+                                            <!-- Loaded content -->
+                                            <div x-show="!isLoadingNotes" x-cloak>
+                                                <!-- Search input (only show if notes exist) -->
+                                                <template x-if="notes.length > 0">
+                                                    <div class="mb-3">
+                                                        <input type="text"
+                                                               x-model="searchQuery"
+                                                               placeholder="搜尋備忘錄內容或作者..."
+                                                               class="block w-full rounded-md border-gray-300 dark:border-gray-600 shadow-sm focus:border-indigo-500 dark:focus:border-indigo-500 focus:ring-indigo-500 dark:focus:ring-indigo-500 sm:text-sm dark:bg-gray-700 dark:text-gray-200">
+                                                    </div>
+                                                </template>
+
+                                                <!-- Notes list -->
+                                                <template x-if="filteredNotes.length > 0">
+                                                    <div class="space-y-3 max-h-64 overflow-y-auto">
+                                                        <template x-for="note in filteredNotes" :key="note.id">
+                                                            <div class="border-l-4 border-blue-500 dark:border-blue-400 pl-3 py-2">
+                                                                <p class="text-sm text-gray-900 dark:text-gray-100 whitespace-pre-line" x-text="note.content"></p>
+                                                                <p class="text-xs text-gray-500 dark:text-gray-400 mt-1">
+                                                                    <span x-text="note.author.name"></span>
+                                                                    <span class="mx-1">&middot;</span>
+                                                                    <span x-text="formatDateTime(note.created_at)"></span>
+                                                                </p>
+                                                            </div>
+                                                        </template>
+                                                    </div>
+                                                </template>
+
+                                                <!-- Empty state: no notes at all -->
+                                                <template x-if="notesLoaded && notes.length === 0">
+                                                    <p class="text-sm text-gray-500 dark:text-gray-400 py-2">尚無備註</p>
+                                                </template>
+
+                                                <!-- No search results -->
+                                                <template x-if="notes.length > 0 && filteredNotes.length === 0">
+                                                    <p class="text-sm text-gray-500 dark:text-gray-400 py-2">找不到符合的備忘錄</p>
+                                                </template>
+                                            </div>
+                                        </td>
+                                    </tr>
+                                    </template>
                                 @empty
                                     <tr>
                                         <td colspan="8" class="px-4 py-4 text-sm text-gray-500 dark:text-gray-400">