diff --git a/public/images/investigation_scene.jpg b/public/images/investigation_scene.jpg
new file mode 100644
index 0000000..c7847d7
Binary files /dev/null and b/public/images/investigation_scene.jpg differ
diff --git a/public/scenes/demo.json b/public/scenes/demo.json
index 9e0b0e8..aa9d466 100644
--- a/public/scenes/demo.json
+++ b/public/scenes/demo.json
@@ -5,77 +5,14 @@
     "courage": 0,
     "investigation": 0
   },
-  "achievements": [
-    {
-      "id": "qte_master",
-      "title": "反应达人",
-      "description": "成功完成一次 QTE",
-      "icon": "",
-      "hidden": false,
-      "condition": { "variable": "qte_succeeded", "op": ">=", "value": 1 }
-    },
-    {
-      "id": "explorer",
-      "title": "探索者",
-      "description": "搜索过房间的所有角落",
-      "icon": "",
-      "hidden": false,
-      "condition": { "variable": "investigation", "op": ">=", "value": 2 }
-    },
-    {
-      "id": "game_finished",
-      "title": "通关达成",
-      "description": "完成一次游戏",
-      "icon": "",
-      "hidden": false,
-      "condition": { "variable": "completed_game", "op": ">=", "value": 1 }
-    }
-  ],
-  "endings": [
-    { "id": "trust_end", "label": "信任的伙伴", "sceneId": "trust_ending", "chapterId": "ch1", "thumbnail": "/images/end_trust.jpg" },
-    { "id": "alone_end", "label": "独行之路", "sceneId": "alone_ending", "chapterId": "ch1", "thumbnail": "/images/end_alone.jpg" },
-    { "id": "continue_end", "label": "继续前行", "sceneId": "continue_ending", "chapterId": "ch3", "thumbnail": "/images/end_continue.jpg" }
-  ],
-  "chapters": [
-    {
-      "id": "ch1",
-      "label": "第一章：醒来",
-      "startScene": "intro",
-      "thumbnail": "/images/ch1.jpg",
-      "defaultVariables": { "trust": 50, "courage": 0, "investigation": 0 }
-    },
-    {
-      "id": "ch2",
-      "label": "第二章：调查",
-      "startScene": "desk_detail",
-      "thumbnail": "/images/ch2.jpg",
-      "defaultVariables": { "trust": 60, "courage": 10, "investigation": 1 }
-    },
-    {
-      "id": "ch3",
-      "label": "第三章：终局",
-      "startScene": "qte_success",
-      "thumbnail": "/images/ch3.jpg",
-      "defaultVariables": { "trust": 70, "courage": 20, "investigation": 2 }
-    }
-  ],
   "scenes": {
     "intro": {
       "id": "intro",
       "videoUrl": "/videos/intro.mp4",
       "subtitleUrl": "/subtitles/intro.vtt",
-      "subtitles": {
-        "zh": "/subtitles/intro.vtt",
-        "en": "/subtitles/intro_en.vtt"
-      },
-      "bgmUrl": "/audio/calm_bgm.mp3",
-      "bgmVolume": 0.6,
-      "bgmCrossFade": 1.5,
-      "videoMuted": true,
       "choices": [
         {
           "text": "走向左边那扇发光的门",
-          "textKey": "scene.intro.choice.left_door",
           "targetScene": "left_door",
           "effects": [
             { "type": "add", "target": "courage", "value": 10 }
@@ -83,7 +20,6 @@
         },
         {
           "text": "走向右边那扇普通的门",
-          "textKey": "scene.intro.choice.right_door",
           "targetScene": "right_door",
           "effects": [
             { "type": "add", "target": "courage", "value": -5 }
@@ -91,12 +27,10 @@
         },
         {
           "text": "仔细搜索房间",
-          "textKey": "scene.intro.choice.search",
           "targetScene": "investigation_site"
         },
         {
           "text": "留在原地，什么也不做",
-          "textKey": "scene.intro.choice.stay",
           "targetScene": "stay"
         }
       ]
@@ -138,6 +72,7 @@
         }
       ],
       "choices": [
+        { "text": "离开房间", "targetScene": "corridor" }
       ]
     },
     "corridor": {
@@ -177,8 +112,6 @@
       "choices": [
         {
           "text": "与陌生人握手",
-          "textKey": "scene.left_door.choice.handshake",
-          "prompt": "陌生人会记住你的善意",
           "targetScene": "trust_ending",
           "effects": [
             { "type": "add", "target": "trust", "value": 30 }
@@ -193,11 +126,6 @@
     "right_door": {
       "id": "right_door",
       "videoUrl": "/videos/right_door.mp4",
-      "skippable": false,
-      "bgmUrl": "/audio/tense_bgm.mp3",
-      "bgmVolume": 0.7,
-      "bgmCrossFade": 2.0,
-      "videoMuted": true,
       "qte": {
         "triggerTime": 1.0,
         "prompt": "躲避飞来的石块！",
@@ -206,10 +134,7 @@
         "successScene": "qte_success",
         "failScene": "qte_fail",
         "effects": {
-          "success": [
-            { "type": "add", "target": "courage", "value": 15 },
-            { "type": "set", "target": "qte_succeeded", "value": 1 }
-          ],
+          "success": [{ "type": "add", "target": "courage", "value": 15 }],
           "fail": [{ "type": "add", "target": "trust", "value": -20 }]
         }
       }
@@ -258,16 +183,9 @@
     },
     "stay": {
       "id": "stay",
-      "videoUrl": "/videos/stay_loop.mp4",
+      "videoUrl": "/videos/stay.mp4",
       "subtitleUrl": "/subtitles/stay.vtt",
-      "bgmUrl": "/audio/calm_bgm.mp3",
-      "bgmVolume": 0.6,
-      "videoMuted": true,
-      "loopStart": 3.0,
-      "loopEnd": 6.0,
-      "choices": [
-        { "text": "站起来离开", "targetScene": "alone_ending" }
-      ]
+      "nextScene": "alone_ending"
     },
     "trust_ending": {
       "id": "trust_ending",
@@ -275,8 +193,6 @@
       "choices": [
         {
           "text": "开启信任的旅程（需要 trust >= 80）",
-          "textKey": "scene.trust_ending.choice.journey",
-          "prompt": "你们的羁绊将改变一切",
           "targetScene": "secret_ending",
           "conditions": [
             { "variable": "trust", "op": ">=", "value": 80 }
@@ -296,10 +212,7 @@
     "alone_ending": {
       "id": "alone_ending",
       "videoUrl": "/videos/alone_ending.mp4",
-      "choices": [],
-      "onEnter": [
-        { "type": "set", "target": "completed_game", "value": 1 }
-      ]
+      "choices": []
     },
     "continue_ending": {
       "id": "continue_ending",
diff --git a/public/subtitles/intro_en.vtt b/public/subtitles/intro_en.vtt
new file mode 100644
index 0000000..446c3ab
--- /dev/null
+++ b/public/subtitles/intro_en.vtt
@@ -0,0 +1,5 @@
+WEBVTT
+00:00.000 --> 00:02.000
+You wake up in a strange room
+00:02.500 --> 00:03.000
+Two doors stand before you. You must choose.
diff --git a/public/subtitles/investigation.vtt b/public/subtitles/investigation.vtt
new file mode 100644
index 0000000..b5c4e49
--- /dev/null
+++ b/public/subtitles/investigation.vtt
@@ -0,0 +1,4 @@
+WEBVTT
+
+00:00.000 --> 00:05.000
+你走进了一个凌乱的房间，仔细观察四周...
diff --git a/public/subtitles/left_door.vtt b/public/subtitles/left_door.vtt
new file mode 100644
index 0000000..a453522
--- /dev/null
+++ b/public/subtitles/left_door.vtt
@@ -0,0 +1,7 @@
+WEBVTT
+
+00:00.000 --> 00:02.500
+你走进了发光的门，来到一个明亮的大厅
+
+00:02.500 --> 00:03.000
+一位陌生人向你伸出了手
diff --git a/public/subtitles/left_door_en.vtt b/public/subtitles/left_door_en.vtt
new file mode 100644
index 0000000..4be17b2
--- /dev/null
+++ b/public/subtitles/left_door_en.vtt
@@ -0,0 +1,5 @@
+WEBVTT
+00:00.000 --> 00:02.500
+You enter the glowing door into a bright hall
+00:02.500 --> 00:03.000
+A stranger extends their hand toward you
diff --git a/public/subtitles/stay.vtt b/public/subtitles/stay.vtt
new file mode 100644
index 0000000..0aaf9de
--- /dev/null
+++ b/public/subtitles/stay.vtt
@@ -0,0 +1,4 @@
+WEBVTT
+
+00:00.000 --> 00:03.000
+你选择留在原地，时间缓缓流逝...
diff --git a/public/subtitles/stay_en.vtt b/public/subtitles/stay_en.vtt
new file mode 100644
index 0000000..a52572d
--- /dev/null
+++ b/public/subtitles/stay_en.vtt
@@ -0,0 +1,3 @@
+WEBVTT
+00:00.000 --> 00:03.000
+You choose to stay. Time passes slowly...
diff --git a/public/videos/alone_ending.mp4 b/public/videos/alone_ending.mp4
new file mode 100644
index 0000000..1fc207e
Binary files /dev/null and b/public/videos/alone_ending.mp4 differ
diff --git a/public/videos/continue_ending.mp4 b/public/videos/continue_ending.mp4
new file mode 100644
index 0000000..542351a
Binary files /dev/null and b/public/videos/continue_ending.mp4 differ
diff --git a/public/videos/corridor.mp4 b/public/videos/corridor.mp4
new file mode 100644
index 0000000..3a0cc28
Binary files /dev/null and b/public/videos/corridor.mp4 differ
diff --git a/public/videos/left_door.mp4 b/public/videos/left_door.mp4
new file mode 100644
index 0000000..db2bb35
Binary files /dev/null and b/public/videos/left_door.mp4 differ
diff --git a/public/videos/qte_fail.mp4 b/public/videos/qte_fail.mp4
new file mode 100644
index 0000000..b8a1e56
Binary files /dev/null and b/public/videos/qte_fail.mp4 differ
diff --git a/public/videos/qte_success.mp4 b/public/videos/qte_success.mp4
new file mode 100644
index 0000000..49d1e76
Binary files /dev/null and b/public/videos/qte_success.mp4 differ
diff --git a/public/videos/right_door.mp4 b/public/videos/right_door.mp4
new file mode 100644
index 0000000..61b76a1
Binary files /dev/null and b/public/videos/right_door.mp4 differ
diff --git a/public/videos/stay.mp4 b/public/videos/stay.mp4
new file mode 100644
index 0000000..b306dd8
Binary files /dev/null and b/public/videos/stay.mp4 differ
diff --git a/public/videos/trust_ending.mp4 b/public/videos/trust_ending.mp4
new file mode 100644
index 0000000..f3a00f9
Binary files /dev/null and b/public/videos/trust_ending.mp4 differ