diff --git a/docs/roadmap.md b/docs/roadmap.md
index 69bbc76..805a9e8 100644
--- a/docs/roadmap.md
+++ b/docs/roadmap.md
@@ -15,6 +15,7 @@ Build a small complete tactical RPG loop:
 - Vite, TypeScript, and Phaser project foundation
 - Cinematic title scene with an original Taoyuan Oath background, subtle motion, menu UI, and first-input audio
 - Cinematic prologue pages with high-resolution story backgrounds, character portraits, and scenario data
+- File-based original BGM loops, local generated Korean narration/voice lines, and automatic music ducking during speech
 - First battle scene with a 12x12 map, terrain colors, unit placement, and movement range preview
 - Flow verification script from title to first battle
 
diff --git a/package.json b/package.json
index 83e82a0..836a77d 100644
--- a/package.json
+++ b/package.json
@@ -6,6 +6,7 @@
   "scripts": {
     "dev": "vite --host 0.0.0.0",
     "build": "tsc && vite build",
+    "generate:audio": "node scripts/generate-bgm.mjs && node scripts/generate-voice-assets.mjs",
     "preview": "vite preview --host 0.0.0.0",
     "verify:flow": "node scripts/verify-flow.mjs"
   },
diff --git a/scripts/generate-bgm.mjs b/scripts/generate-bgm.mjs
new file mode 100644
index 0000000..95a8320
--- /dev/null
+++ b/scripts/generate-bgm.mjs
@@ -0,0 +1,227 @@
+import { mkdirSync, writeFileSync } from 'node:fs';
+import { join } from 'node:path';
+
+const sampleRate = 22050;
+const duration = 32;
+const outputDir = 'src/assets/audio/bgm';
+
+mkdirSync(outputDir, { recursive: true });
+
+const tracks = [
+  {
+    name: 'title-theme',
+    root: 196,
+    tempo: 72,
+    drum: 0.34,
+    melody: [0, 2, 4, 7, 9, 7, 4, 2],
+    bass: [0, 0, -5, -3],
+    color: 'warm'
+  },
+  {
+    name: 'story-dark',
+    root: 146.83,
+    tempo: 58,
+    drum: 0.22,
+    melody: [0, -3, 0, 2, -5, -3, 0, -7],
+    bass: [0, -7, -5, -3],
+    color: 'dark'
+  },
+  {
+    name: 'oath-theme',
+    root: 220,
+    tempo: 66,
+    drum: 0.24,
+    melody: [0, 4, 7, 9, 12, 9, 7, 4],
+    bass: [0, -5, -3, -7],
+    color: 'gold'
+  },
+  {
+    name: 'militia-theme',
+    root: 174.61,
+    tempo: 82,
+    drum: 0.42,
+    melody: [0, 2, 5, 7, 9, 7, 5, 2],
+    bass: [0, -5, 0, -3],
+    color: 'earth'
+  },
+  {
+    name: 'battle-prep',
+    root: 164.81,
+    tempo: 94,
+    drum: 0.5,
+    melody: [0, 3, 5, 7, 10, 7, 5, 3],
+    bass: [0, 0, -2, -5],
+    color: 'steel'
+  }
+];
+
+for (const track of tracks) {
+  const buffer = new Float32Array(sampleRate * duration);
+  buildTrack(buffer, track);
+  normalize(buffer, 0.86);
+  writeFileSync(join(outputDir, `${track.name}.wav`), encodeWav(buffer));
+}
+
+function buildTrack(buffer, track) {
+  const beat = 60 / track.tempo;
+  const bar = beat * 4;
+
+  for (let t = 0; t < duration; t += bar) {
+    for (let i = 0; i < 4; i += 1) {
+      const bassFreq = note(track.root, track.bass[i % track.bass.length] - 12);
+      addTone(buffer, t + i * beat, beat * 1.9, bassFreq, 0.075, 'soft');
+      addTone(buffer, t + i * beat, beat * 1.9, bassFreq * 2, 0.025, 'soft');
+    }
+  }
+
+  for (let t = 0; t < duration; t += beat * 2) {
+    const step = Math.floor(t / (beat * 2)) % track.melody.length;
+    const freq = note(track.root, track.melody[step]);
+    addPluck(buffer, t + 0.04, beat * 1.65, freq, 0.12, track.color);
+    addPluck(buffer, t + beat * 0.95, beat * 0.9, freq * 1.5, 0.045, track.color);
+  }
+
+  for (let t = 0; t < duration; t += beat) {
+    if (Math.round(t / beat) % 4 === 0) {
+      addDrum(buffer, t, 0.26, track.drum);
+    } else if (track.drum > 0.3 && Math.round(t / beat) % 2 === 0) {
+      addDrum(buffer, t, 0.16, track.drum * 0.45);
+    }
+  }
+
+  for (let t = 0; t < duration; t += bar * 2) {
+    addNoiseWash(buffer, t, bar * 1.8, track.color === 'dark' ? 0.012 : 0.007);
+  }
+
+  for (let i = 0; i < buffer.length; i += 1) {
+    const seconds = i / sampleRate;
+    const edge = Math.min(1, seconds / 0.6, (duration - seconds) / 0.6);
+    buffer[i] *= Math.max(0, edge);
+  }
+}
+
+function note(root, semitone) {
+  return root * 2 ** (semitone / 12);
+}
+
+function addTone(buffer, start, length, freq, gain, shape) {
+  const startIndex = Math.floor(start * sampleRate);
+  const count = Math.floor(length * sampleRate);
+
+  for (let i = 0; i < count; i += 1) {
+    const index = startIndex + i;
+    if (index >= buffer.length) {
+      break;
+    }
+
+    const t = i / sampleRate;
+    const env = Math.sin(Math.PI * Math.min(1, i / count));
+    const wave = Math.sin(2 * Math.PI * freq * t) + Math.sin(2 * Math.PI * freq * 2 * t) * 0.18;
+    buffer[index] += wave * gain * env * (shape === 'soft' ? 0.78 : 1);
+  }
+}
+
+function addPluck(buffer, start, length, freq, gain, color) {
+  const startIndex = Math.floor(start * sampleRate);
+  const count = Math.floor(length * sampleRate);
+  const brightness = color === 'gold' ? 0.36 : color === 'steel' ? 0.42 : 0.28;
+
+  for (let i = 0; i < count; i += 1) {
+    const index = startIndex + i;
+    if (index >= buffer.length) {
+      break;
+    }
+
+    const t = i / sampleRate;
+    const env = Math.exp(-t * 4.8) * Math.min(1, t / 0.02);
+    const wave =
+      Math.sin(2 * Math.PI * freq * t) +
+      Math.sin(2 * Math.PI * freq * 2 * t) * brightness +
+      Math.sin(2 * Math.PI * freq * 3 * t) * 0.14;
+    buffer[index] += wave * gain * env;
+  }
+}
+
+function addDrum(buffer, start, length, gain) {
+  const startIndex = Math.floor(start * sampleRate);
+  const count = Math.floor(length * sampleRate);
+  let seed = 1337 + startIndex;
+
+  for (let i = 0; i < count; i += 1) {
+    const index = startIndex + i;
+    if (index >= buffer.length) {
+      break;
+    }
+
+    const t = i / sampleRate;
+    const env = Math.exp(-t * 15);
+    const freq = 96 - t * 120;
+    seed = (seed * 1664525 + 1013904223) >>> 0;
+    const noise = ((seed / 0xffffffff) * 2 - 1) * 0.18;
+    const wave = Math.sin(2 * Math.PI * Math.max(42, freq) * t) + noise;
+    buffer[index] += wave * gain * env;
+  }
+}
+
+function addNoiseWash(buffer, start, length, gain) {
+  const startIndex = Math.floor(start * sampleRate);
+  const count = Math.floor(length * sampleRate);
+  let seed = 4219 + startIndex;
+  let previous = 0;
+
+  for (let i = 0; i < count; i += 1) {
+    const index = startIndex + i;
+    if (index >= buffer.length) {
+      break;
+    }
+
+    seed = (seed * 1103515245 + 12345) >>> 0;
+    const raw = (seed / 0xffffffff) * 2 - 1;
+    previous = previous * 0.98 + raw * 0.02;
+    const env = Math.sin(Math.PI * i / count);
+    buffer[index] += previous * gain * env;
+  }
+}
+
+function normalize(buffer, target) {
+  let peak = 0;
+  for (const value of buffer) {
+    peak = Math.max(peak, Math.abs(value));
+  }
+
+  if (peak === 0) {
+    return;
+  }
+
+  const scale = target / peak;
+  for (let i = 0; i < buffer.length; i += 1) {
+    buffer[i] *= scale;
+  }
+}
+
+function encodeWav(buffer) {
+  const bytesPerSample = 2;
+  const dataSize = buffer.length * bytesPerSample;
+  const wav = Buffer.alloc(44 + dataSize);
+
+  wav.write('RIFF', 0);
+  wav.writeUInt32LE(36 + dataSize, 4);
+  wav.write('WAVE', 8);
+  wav.write('fmt ', 12);
+  wav.writeUInt32LE(16, 16);
+  wav.writeUInt16LE(1, 20);
+  wav.writeUInt16LE(1, 22);
+  wav.writeUInt32LE(sampleRate, 24);
+  wav.writeUInt32LE(sampleRate * bytesPerSample, 28);
+  wav.writeUInt16LE(bytesPerSample, 32);
+  wav.writeUInt16LE(16, 34);
+  wav.write('data', 36);
+  wav.writeUInt32LE(dataSize, 40);
+
+  for (let i = 0; i < buffer.length; i += 1) {
+    const value = Math.max(-1, Math.min(1, buffer[i]));
+    wav.writeInt16LE(Math.round(value * 32767), 44 + i * bytesPerSample);
+  }
+
+  return wav;
+}
diff --git a/scripts/generate-voice-assets.mjs b/scripts/generate-voice-assets.mjs
new file mode 100644
index 0000000..430c3e1
--- /dev/null
+++ b/scripts/generate-voice-assets.mjs
@@ -0,0 +1,127 @@
+import { mkdirSync } from 'node:fs';
+import { resolve } from 'node:path';
+import { spawnSync } from 'node:child_process';
+
+const outputDir = resolve('src/assets/audio/voice/prologue');
+
+mkdirSync(outputDir, { recursive: true });
+
+const voiceName = 'Microsoft Heami Desktop';
+
+const lines = [
+  {
+    name: 'yellow-turban-chaos',
+    role: 'narrator',
+    rate: -2,
+    volume: 86,
+    text: '중평 원년, 황건의 깃발이 각지에서 일어섰다. 관군은 흩어지고, 마을마다 불안한 소문이 번져갔다.'
+  },
+  {
+    name: 'liu-bei-resolve',
+    role: 'liuBei',
+    rate: -1,
+    volume: 92,
+    text: '천실의 백성이 이토록 고통받는데, 어찌 초개처럼 그늘에 숨어 있을 수 있겠는가.'
+  },
+  {
+    name: 'zhang-fei-joins',
+    role: 'zhangFei',
+    rate: 1,
+    volume: 100,
+    text: '좋소! 나라를 바로잡고 백성을 구한다면, 내 재산과 힘을 모두 아끼지 않겠소.'
+  },
+  {
+    name: 'guan-yu-joins',
+    role: 'guanYu',
+    rate: -3,
+    volume: 95,
+    text: '서로의 뜻을 믿고 의로운 길을 함께한다면, 천 리라도 멀다 하지 않겠습니다.'
+  },
+  {
+    name: 'oath-narration',
+    role: 'narrator',
+    rate: -2,
+    volume: 88,
+    text: '복사꽃 향기가 흩날리는 동산에서 세 사람은 하늘과 땅 앞에 고했다.'
+  },
+  {
+    name: 'oath-liu-bei',
+    role: 'liuBei',
+    rate: -1,
+    volume: 94,
+    text: '우리는 태어난 날은 달라도, 오늘부터 뜻을 함께한다. 백성을 구하고 천하를 바로 세우는 길에서 물러서지 않겠다.'
+  },
+  {
+    name: 'oath-brothers',
+    role: 'guanYu',
+    rate: -3,
+    volume: 96,
+    text: '의리를 저버리지 않고, 형제를 저버리지 않겠습니다.'
+  },
+  {
+    name: 'militia-rises',
+    role: 'zhangFei',
+    rate: 1,
+    volume: 100,
+    text: '창을 들 사람은 앞으로 나오시오! 오늘 모인 이름 없는 무리가 내일의 방패가 될 것이오!'
+  },
+  {
+    name: 'first-sortie',
+    role: 'liuBei',
+    rate: -1,
+    volume: 94,
+    text: '우리는 아직 작다. 그러나 오늘 한 마을을 지켜낸다면, 그 뜻은 천하로 번져갈 것이다.'
+  },
+  {
+    name: 'battle-briefing',
+    role: 'narrator',
+    rate: -2,
+    volume: 88,
+    text: '의용군은 마을 입구로 향했다. 첫 전투가 곧 시작된다.'
+  }
+];
+
+for (const line of lines) {
+  const output = resolve(outputDir, `${line.name}.wav`);
+  generateVoice({ ...line, output });
+}
+
+function generateVoice(item) {
+  const payload = Buffer.from(JSON.stringify({ ...item, voiceName }), 'utf8').toString('base64');
+  const powershell = `
+$ErrorActionPreference = 'Stop'
+$ProgressPreference = 'SilentlyContinue'
+Add-Type -AssemblyName System.Speech
+$payload = '${payload}'
+$json = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($payload))
+$item = $json | ConvertFrom-Json
+$synth = New-Object System.Speech.Synthesis.SpeechSynthesizer
+try {
+  try {
+    $synth.SelectVoice($item.voiceName)
+  } catch {
+    $installed = $synth.GetInstalledVoices() | ForEach-Object { $_.VoiceInfo.Name }
+    if ($installed.Count -gt 0) {
+      $synth.SelectVoice($installed[0])
+    }
+  }
+  $synth.Rate = [int]$item.rate
+  $synth.Volume = [int]$item.volume
+  $synth.SetOutputToWaveFile($item.output)
+  $synth.Speak($item.text)
+} finally {
+  $synth.Dispose()
+}
+`;
+
+  const encodedCommand = Buffer.from(powershell, 'utf16le').toString('base64');
+  const result = spawnSync(
+    'powershell.exe',
+    ['-NoProfile', '-ExecutionPolicy', 'Bypass', '-EncodedCommand', encodedCommand],
+    { stdio: 'inherit' }
+  );
+
+  if (result.status !== 0) {
+    throw new Error(`Failed to generate voice asset: ${item.name}`);
+  }
+}
diff --git a/src/assets/audio/bgm/battle-prep.wav b/src/assets/audio/bgm/battle-prep.wav
new file mode 100644
index 0000000..e5cf201
Binary files /dev/null and b/src/assets/audio/bgm/battle-prep.wav differ
diff --git a/src/assets/audio/bgm/militia-theme.wav b/src/assets/audio/bgm/militia-theme.wav
new file mode 100644
index 0000000..b2acdf1
Binary files /dev/null and b/src/assets/audio/bgm/militia-theme.wav differ
diff --git a/src/assets/audio/bgm/oath-theme.wav b/src/assets/audio/bgm/oath-theme.wav
new file mode 100644
index 0000000..b3abc29
Binary files /dev/null and b/src/assets/audio/bgm/oath-theme.wav differ
diff --git a/src/assets/audio/bgm/story-dark.wav b/src/assets/audio/bgm/story-dark.wav
new file mode 100644
index 0000000..c48e7d3
Binary files /dev/null and b/src/assets/audio/bgm/story-dark.wav differ
diff --git a/src/assets/audio/bgm/title-theme.wav b/src/assets/audio/bgm/title-theme.wav
new file mode 100644
index 0000000..4b1456c
Binary files /dev/null and b/src/assets/audio/bgm/title-theme.wav differ
diff --git a/src/assets/audio/voice/prologue/battle-briefing.wav b/src/assets/audio/voice/prologue/battle-briefing.wav
new file mode 100644
index 0000000..7cf1e5c
Binary files /dev/null and b/src/assets/audio/voice/prologue/battle-briefing.wav differ
diff --git a/src/assets/audio/voice/prologue/first-sortie.wav b/src/assets/audio/voice/prologue/first-sortie.wav
new file mode 100644
index 0000000..a897440
Binary files /dev/null and b/src/assets/audio/voice/prologue/first-sortie.wav differ
diff --git a/src/assets/audio/voice/prologue/guan-yu-joins.wav b/src/assets/audio/voice/prologue/guan-yu-joins.wav
new file mode 100644
index 0000000..8b13ec6
Binary files /dev/null and b/src/assets/audio/voice/prologue/guan-yu-joins.wav differ
diff --git a/src/assets/audio/voice/prologue/liu-bei-resolve.wav b/src/assets/audio/voice/prologue/liu-bei-resolve.wav
new file mode 100644
index 0000000..b76dc70
Binary files /dev/null and b/src/assets/audio/voice/prologue/liu-bei-resolve.wav differ
diff --git a/src/assets/audio/voice/prologue/militia-rises.wav b/src/assets/audio/voice/prologue/militia-rises.wav
new file mode 100644
index 0000000..952dfa6
Binary files /dev/null and b/src/assets/audio/voice/prologue/militia-rises.wav differ
diff --git a/src/assets/audio/voice/prologue/oath-brothers.wav b/src/assets/audio/voice/prologue/oath-brothers.wav
new file mode 100644
index 0000000..92ea777
Binary files /dev/null and b/src/assets/audio/voice/prologue/oath-brothers.wav differ
diff --git a/src/assets/audio/voice/prologue/oath-liu-bei.wav b/src/assets/audio/voice/prologue/oath-liu-bei.wav
new file mode 100644
index 0000000..3df5802
Binary files /dev/null and b/src/assets/audio/voice/prologue/oath-liu-bei.wav differ
diff --git a/src/assets/audio/voice/prologue/oath-narration.wav b/src/assets/audio/voice/prologue/oath-narration.wav
new file mode 100644
index 0000000..2199a55
Binary files /dev/null and b/src/assets/audio/voice/prologue/oath-narration.wav differ
diff --git a/src/assets/audio/voice/prologue/yellow-turban-chaos.wav b/src/assets/audio/voice/prologue/yellow-turban-chaos.wav
new file mode 100644
index 0000000..6cd689c
Binary files /dev/null and b/src/assets/audio/voice/prologue/yellow-turban-chaos.wav differ
diff --git a/src/assets/audio/voice/prologue/zhang-fei-joins.wav b/src/assets/audio/voice/prologue/zhang-fei-joins.wav
new file mode 100644
index 0000000..46f21a0
Binary files /dev/null and b/src/assets/audio/voice/prologue/zhang-fei-joins.wav differ
diff --git a/src/game/audio/SoundDirector.ts b/src/game/audio/SoundDirector.ts
index f8165b5..048fc3e 100644
--- a/src/game/audio/SoundDirector.ts
+++ b/src/game/audio/SoundDirector.ts
@@ -1,42 +1,82 @@
+type AudioTrackMap = Record<string, string>;
+export type VoiceRole = 'narrator' | 'liuBei' | 'guanYu' | 'zhangFei';
+
+type PitchSafeAudio = HTMLAudioElement & {
+  preservesPitch?: boolean;
+  mozPreservesPitch?: boolean;
+  webkitPreservesPitch?: boolean;
+};
+
+const rolePlayback: Record<VoiceRole, { rate: number; volume: number }> = {
+  narrator: { rate: 0.98, volume: 0.9 },
+  liuBei: { rate: 0.96, volume: 0.92 },
+  guanYu: { rate: 0.84, volume: 0.95 },
+  zhangFei: { rate: 1.05, volume: 1 }
+};
+
 class SoundDirector {
   private context?: AudioContext;
   private master?: GainNode;
-  private musicGain?: GainNode;
   private started = false;
   private muted = false;
-  private sequenceTimer?: number;
+  private musicTracks: AudioTrackMap = {};
+  private voiceTracks: AudioTrackMap = {};
+  private music?: HTMLAudioElement;
+  private voice?: HTMLAudioElement;
+  private currentMusicKey?: string;
+  private pendingMusicKey?: string;
+  private musicFadeTimer?: number;
+  private musicRampTimer?: number;
+  private readonly musicVolume = 0.46;
+  private readonly duckedMusicVolume = 0.18;
+
+  registerMusicTracks(tracks: AudioTrackMap) {
+    this.musicTracks = tracks;
+  }
+
+  registerVoiceTracks(tracks: AudioTrackMap) {
+    this.voiceTracks = tracks;
+  }
 
   start() {
     if (this.started) {
+      this.resume();
+      if (this.pendingMusicKey) {
+        this.playMusic(this.pendingMusicKey);
+      }
       return;
     }
 
     const AudioContextCtor = window.AudioContext ?? window.webkitAudioContext;
-    if (!AudioContextCtor) {
-      return;
+    if (AudioContextCtor) {
+      this.context = new AudioContextCtor();
+      this.master = this.context.createGain();
+      this.master.gain.value = this.muted ? 0 : 0.34;
+      this.master.connect(this.context.destination);
     }
 
-    this.context = new AudioContextCtor();
-    this.master = this.context.createGain();
-    this.master.gain.value = this.muted ? 0 : 0.34;
-    this.master.connect(this.context.destination);
-
-    this.musicGain = this.context.createGain();
-    this.musicGain.gain.value = 0.0;
-    this.musicGain.connect(this.master);
     this.started = true;
-
-    this.createAmbientBed();
-    this.schedulePlucks();
-    this.musicGain.gain.linearRampToValueAtTime(0.72, this.context.currentTime + 2.4);
+    this.resume();
+    if (this.pendingMusicKey) {
+      this.playMusic(this.pendingMusicKey);
+    }
   }
 
   resume() {
     void this.context?.resume();
+    if (this.started && this.music) {
+      void this.music.play().catch(() => undefined);
+    }
   }
 
   setMuted(muted: boolean) {
     this.muted = muted;
+    if (this.music) {
+      this.music.muted = muted;
+    }
+    if (this.voice) {
+      this.voice.muted = muted;
+    }
 
     if (!this.context || !this.master) {
       return;
@@ -59,60 +99,110 @@ class SoundDirector {
     window.setTimeout(() => this.playTone(495, 0.1, 0.08, 'triangle'), 65);
   }
 
-  private createAmbientBed() {
-    if (!this.context || !this.musicGain) {
+  playMusic(key?: string) {
+    if (!key) {
       return;
     }
 
-    const base = this.context.createOscillator();
-    const fifth = this.context.createOscillator();
-    const filter = this.context.createBiquadFilter();
-    const bedGain = this.context.createGain();
+    this.pendingMusicKey = key;
+    if (!this.started) {
+      return;
+    }
 
-    base.type = 'sine';
-    fifth.type = 'sine';
-    base.frequency.value = 110;
-    fifth.frequency.value = 165;
-    filter.type = 'lowpass';
-    filter.frequency.value = 520;
-    bedGain.gain.value = 0.08;
+    const src = this.musicTracks[key];
+    if (!src) {
+      return;
+    }
 
-    base.connect(filter);
-    fifth.connect(filter);
-    filter.connect(bedGain);
-    bedGain.connect(this.musicGain);
-    base.start();
-    fifth.start();
+    if (this.currentMusicKey === key && this.music) {
+      this.music.muted = this.muted;
+      void this.music.play().catch(() => undefined);
+      return;
+    }
+
+    const previous = this.music;
+    const next = new Audio(src);
+    next.loop = true;
+    next.preload = 'auto';
+    next.muted = this.muted;
+    next.volume = 0;
+
+    this.music = next;
+    this.currentMusicKey = key;
+    void next.play().catch(() => undefined);
+    this.fadeMusic(previous, next, this.voice ? this.duckedMusicVolume : this.musicVolume);
   }
 
-  private schedulePlucks() {
-    if (!this.context) {
+  playVoice(key?: string, role: VoiceRole = 'narrator') {
+    if (!key || !this.started) {
+      this.stopVoice();
+      return;
+    }
+    this.stopVoice(false);
+
+    const src = this.voiceTracks[key];
+    if (!src) {
       return;
     }
 
-    const notes = [220, 247, 294, 330, 392, 330, 294, 247];
-    let index = 0;
-    this.sequenceTimer = window.setInterval(() => {
-      this.playTone(notes[index % notes.length], 0.18, 0.09, 'triangle', true);
-      index += 1;
-    }, 1800);
+    const profile = rolePlayback[role] ?? rolePlayback.narrator;
+    const voice = new Audio(src) as PitchSafeAudio;
+    voice.preload = 'auto';
+    voice.muted = this.muted;
+    voice.volume = profile.volume;
+    voice.playbackRate = profile.rate;
+    voice.preservesPitch = false;
+    voice.mozPreservesPitch = false;
+    voice.webkitPreservesPitch = false;
+    voice.addEventListener('ended', () => {
+      if (this.voice === voice) {
+        this.voice = undefined;
+        this.duckMusic(false);
+      }
+    });
+    voice.addEventListener('error', () => {
+      if (this.voice === voice) {
+        this.voice = undefined;
+        this.duckMusic(false);
+      }
+    });
+
+    this.voice = voice;
+    this.duckMusic(true);
+    void voice.play().catch(() => {
+      if (this.voice === voice) {
+        this.voice = undefined;
+        this.duckMusic(false);
+      }
+    });
+  }
+
+  stopVoice(restoreMusic = true) {
+    if (!this.voice) {
+      return;
+    }
+
+    this.voice.pause();
+    this.voice.currentTime = 0;
+    this.voice = undefined;
+    if (restoreMusic) {
+      this.duckMusic(false);
+    }
   }
 
   private playTone(
     frequency: number,
     duration: number,
     gainValue: number,
-    type: OscillatorType,
-    routeToMusic = false
+    type: OscillatorType
   ) {
-    if (!this.context) {
+    if (!this.context || this.muted) {
       return;
     }
 
     const oscillator = this.context.createOscillator();
     const gain = this.context.createGain();
     const now = this.context.currentTime;
-    const destination = routeToMusic && this.musicGain ? this.musicGain : this.master;
 
     oscillator.type = type;
     oscillator.frequency.value = frequency;
@@ -121,10 +211,73 @@ class SoundDirector {
     gain.gain.exponentialRampToValueAtTime(0.0001, now + duration);
 
     oscillator.connect(gain);
-    gain.connect(destination ?? this.context.destination);
+    gain.connect(this.master ?? this.context.destination);
     oscillator.start(now);
     oscillator.stop(now + duration + 0.04);
   }
+
+  private fadeMusic(previous: HTMLAudioElement | undefined, next: HTMLAudioElement, targetVolume: number) {
+    if (this.musicFadeTimer) {
+      window.clearInterval(this.musicFadeTimer);
+    }
+
+    const duration = 900;
+    const startedAt = performance.now();
+    const previousStartVolume = previous?.volume ?? 0;
+
+    this.musicFadeTimer = window.setInterval(() => {
+      const progress = Math.min(1, (performance.now() - startedAt) / duration);
+      next.volume = targetVolume * progress;
+
+      if (previous) {
+        previous.volume = previousStartVolume * (1 - progress);
+      }
+
+      if (progress >= 1) {
+        if (this.musicFadeTimer) {
+          window.clearInterval(this.musicFadeTimer);
+          this.musicFadeTimer = undefined;
+        }
+        if (previous) {
+          previous.pause();
+          previous.src = '';
+        }
+      }
+    }, 32);
+  }
+
+  private duckMusic(ducked: boolean) {
+    if (!this.music) {
+      return;
+    }
+
+    if (ducked && this.musicFadeTimer) {
+      window.clearInterval(this.musicFadeTimer);
+      this.musicFadeTimer = undefined;
+    }
+
+    if (this.musicRampTimer) {
+      window.clearInterval(this.musicRampTimer);
+    }
+
+    const from = this.music.volume;
+    const to = ducked ? this.duckedMusicVolume : this.musicVolume;
+    const duration = 260;
+    const startedAt = performance.now();
+
+    this.musicRampTimer = window.setInterval(() => {
+      if (!this.music) {
+        return;
+      }
+
+      const progress = Math.min(1, (performance.now() - startedAt) / duration);
+      this.music.volume = from + (to - from) * progress;
+      if (progress >= 1 && this.musicRampTimer) {
+        window.clearInterval(this.musicRampTimer);
+        this.musicRampTimer = undefined;
+      }
+    }, 32);
+  }
 }
 
 declare global {
diff --git a/src/game/audio/audioAssets.ts b/src/game/audio/audioAssets.ts
new file mode 100644
index 0000000..ac864ff
--- /dev/null
+++ b/src/game/audio/audioAssets.ts
@@ -0,0 +1,39 @@
+import battlePrepUrl from '../../assets/audio/bgm/battle-prep.wav';
+import militiaThemeUrl from '../../assets/audio/bgm/militia-theme.wav';
+import oathThemeUrl from '../../assets/audio/bgm/oath-theme.wav';
+import storyDarkUrl from '../../assets/audio/bgm/story-dark.wav';
+import titleThemeUrl from '../../assets/audio/bgm/title-theme.wav';
+import battleBriefingVoiceUrl from '../../assets/audio/voice/prologue/battle-briefing.wav';
+import firstSortieVoiceUrl from '../../assets/audio/voice/prologue/first-sortie.wav';
+import guanYuJoinsVoiceUrl from '../../assets/audio/voice/prologue/guan-yu-joins.wav';
+import liuBeiResolveVoiceUrl from '../../assets/audio/voice/prologue/liu-bei-resolve.wav';
+import militiaRisesVoiceUrl from '../../assets/audio/voice/prologue/militia-rises.wav';
+import oathBrothersVoiceUrl from '../../assets/audio/voice/prologue/oath-brothers.wav';
+import oathLiuBeiVoiceUrl from '../../assets/audio/voice/prologue/oath-liu-bei.wav';
+import oathNarrationVoiceUrl from '../../assets/audio/voice/prologue/oath-narration.wav';
+import yellowTurbanChaosVoiceUrl from '../../assets/audio/voice/prologue/yellow-turban-chaos.wav';
+import zhangFeiJoinsVoiceUrl from '../../assets/audio/voice/prologue/zhang-fei-joins.wav';
+
+export const musicTracks = {
+  'title-theme': titleThemeUrl,
+  'story-dark': storyDarkUrl,
+  'oath-theme': oathThemeUrl,
+  'militia-theme': militiaThemeUrl,
+  'battle-prep': battlePrepUrl
+} as const;
+
+export const voiceTracks = {
+  'yellow-turban-chaos': yellowTurbanChaosVoiceUrl,
+  'liu-bei-resolve': liuBeiResolveVoiceUrl,
+  'zhang-fei-joins': zhangFeiJoinsVoiceUrl,
+  'guan-yu-joins': guanYuJoinsVoiceUrl,
+  'oath-narration': oathNarrationVoiceUrl,
+  'oath-liu-bei': oathLiuBeiVoiceUrl,
+  'oath-brothers': oathBrothersVoiceUrl,
+  'militia-rises': militiaRisesVoiceUrl,
+  'first-sortie': firstSortieVoiceUrl,
+  'battle-briefing': battleBriefingVoiceUrl
+} as const;
+
+export type MusicTrackKey = keyof typeof musicTracks;
+export type VoiceTrackKey = keyof typeof voiceTracks;
diff --git a/src/game/data/scenario.ts b/src/game/data/scenario.ts
index ac39cb3..5db25f9 100644
--- a/src/game/data/scenario.ts
+++ b/src/game/data/scenario.ts
@@ -1,4 +1,5 @@
 export type PortraitKey = 'liuBei' | 'guanYu' | 'zhangFei';
+export type VoiceRole = 'narrator' | PortraitKey;
 
 export type StoryPage = {
   id: string;
@@ -6,6 +7,9 @@ export type StoryPage = {
   background: string;
   speaker?: string;
   portrait?: PortraitKey;
+  bgm?: string;
+  voice?: string;
+  voiceRole?: VoiceRole;
   text: string;
 };
 
@@ -33,12 +37,18 @@ export type BattleMap = {
 export const prologuePages: StoryPage[] = [
   {
     id: 'yellow-turban-chaos',
+    bgm: 'story-dark',
+    voice: 'yellow-turban-chaos',
+    voiceRole: 'narrator',
     chapter: '난세의 시작',
     background: 'story-chaos',
     text: '중평 원년, 황건의 깃발이 각지에서 일어났다. 관군은 흩어지고, 마을마다 피난 행렬이 이어졌다.'
   },
   {
     id: 'liu-bei-resolve',
+    bgm: 'story-dark',
+    voice: 'liu-bei-resolve',
+    voiceRole: 'liuBei',
     chapter: '탁현의 방',
     background: 'story-liu-bei',
     speaker: '유비',
@@ -47,6 +57,9 @@ export const prologuePages: StoryPage[] = [
   },
   {
     id: 'zhang-fei-joins',
+    bgm: 'story-dark',
+    voice: 'zhang-fei-joins',
+    voiceRole: 'zhangFei',
     chapter: '뜻이 모이다',
     background: 'story-three-heroes',
     speaker: '장비',
@@ -55,6 +68,9 @@ export const prologuePages: StoryPage[] = [
   },
   {
     id: 'guan-yu-joins',
+    bgm: 'story-dark',
+    voice: 'guan-yu-joins',
+    voiceRole: 'guanYu',
     chapter: '뜻이 모이다',
     background: 'story-three-heroes',
     speaker: '관우',
@@ -63,12 +79,18 @@ export const prologuePages: StoryPage[] = [
   },
   {
     id: 'oath-narration',
+    bgm: 'oath-theme',
+    voice: 'oath-narration',
+    voiceRole: 'narrator',
     chapter: '도원결의',
     background: 'title-taoyuan',
     text: '복숭아꽃이 흩날리는 동산에서 세 사람은 하늘과 땅에 고했다.'
   },
   {
     id: 'oath-liu-bei',
+    bgm: 'oath-theme',
+    voice: 'oath-liu-bei',
+    voiceRole: 'liuBei',
     chapter: '도원결의',
     background: 'title-taoyuan',
     speaker: '유비',
@@ -77,6 +99,9 @@ export const prologuePages: StoryPage[] = [
   },
   {
     id: 'oath-brothers',
+    bgm: 'oath-theme',
+    voice: 'oath-brothers',
+    voiceRole: 'guanYu',
     chapter: '도원결의',
     background: 'title-taoyuan',
     speaker: '관우',
@@ -85,6 +110,9 @@ export const prologuePages: StoryPage[] = [
   },
   {
     id: 'militia-rises',
+    bgm: 'militia-theme',
+    voice: 'militia-rises',
+    voiceRole: 'zhangFei',
     chapter: '의용군 모집',
     background: 'story-militia',
     speaker: '장비',
@@ -93,6 +121,9 @@ export const prologuePages: StoryPage[] = [
   },
   {
     id: 'first-sortie',
+    bgm: 'battle-prep',
+    voice: 'first-sortie',
+    voiceRole: 'liuBei',
     chapter: '첫 출진',
     background: 'story-sortie',
     speaker: '유비',
@@ -101,6 +132,9 @@ export const prologuePages: StoryPage[] = [
   },
   {
     id: 'battle-briefing',
+    bgm: 'battle-prep',
+    voice: 'battle-briefing',
+    voiceRole: 'narrator',
     chapter: '황건적 토벌',
     background: 'story-sortie',
     text: '의용군은 마을 어귀로 향했다. 첫 싸움은 곧 시작된다.'
diff --git a/src/game/scenes/BattleScene.ts b/src/game/scenes/BattleScene.ts
index cb8cb48..746cf0d 100644
--- a/src/game/scenes/BattleScene.ts
+++ b/src/game/scenes/BattleScene.ts
@@ -1,4 +1,5 @@
 import Phaser from 'phaser';
+import { soundDirector } from '../audio/SoundDirector';
 import { firstBattleMap, firstBattleUnits, type TerrainType, type UnitData } from '../data/scenario';
 import { palette } from '../ui/palette';
 
@@ -24,6 +25,8 @@ export class BattleScene extends Phaser.Scene {
 
   create() {
     const { width, height } = this.scale;
+    soundDirector.stopVoice();
+    soundDirector.playMusic('battle-prep');
     this.add.rectangle(0, 0, width, height, 0x0f1418).setOrigin(0);
     this.drawMap();
     this.drawUnits();
diff --git a/src/game/scenes/StoryScene.ts b/src/game/scenes/StoryScene.ts
index c18bdc2..8756eae 100644
--- a/src/game/scenes/StoryScene.ts
+++ b/src/game/scenes/StoryScene.ts
@@ -1,4 +1,5 @@
 import Phaser from 'phaser';
+import { soundDirector } from '../audio/SoundDirector';
 import { prologuePages, type PortraitKey, type StoryPage } from '../data/scenario';
 import { palette } from '../ui/palette';
 
@@ -114,6 +115,8 @@ export class StoryScene extends Phaser.Scene {
   }
 
   private applyPage(page: StoryPage) {
+    soundDirector.playMusic(page.bgm);
+    soundDirector.playVoice(page.voice, page.voiceRole ?? page.portrait ?? 'narrator');
     this.applyBackground(page.background);
     this.chapterText?.setText(page.chapter);
 
diff --git a/src/game/scenes/TitleScene.ts b/src/game/scenes/TitleScene.ts
index 48cb983..1cfa91f 100644
--- a/src/game/scenes/TitleScene.ts
+++ b/src/game/scenes/TitleScene.ts
@@ -17,8 +17,15 @@ export class TitleScene extends Phaser.Scene {
     this.drawTitleMark(width, height);
     this.drawMenu(width, height);
 
-    this.input.once('pointerdown', () => soundDirector.start());
-    this.input.keyboard?.once('keydown', () => soundDirector.start());
+    soundDirector.playMusic('title-theme');
+    const unlockAudio = () => {
+      soundDirector.start();
+      soundDirector.resume();
+      soundDirector.playMusic('title-theme');
+    };
+
+    this.input.once('pointerdown', unlockAudio);
+    this.input.keyboard?.once('keydown', unlockAudio);
     this.input.keyboard?.once('keydown-ENTER', () => this.startGame());
   }
 
@@ -275,6 +282,8 @@ export class TitleScene extends Phaser.Scene {
   }
 
   private startGame() {
+    soundDirector.start();
+    soundDirector.resume();
     soundDirector.playSelect();
     this.scene.start('StoryScene');
   }
diff --git a/src/main.ts b/src/main.ts
index 4e59c4c..1600ecf 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -1,4 +1,6 @@
 import Phaser from 'phaser';
+import { musicTracks, voiceTracks } from './game/audio/audioAssets';
+import { soundDirector } from './game/audio/SoundDirector';
 import { BattleScene } from './game/scenes/BattleScene';
 import { BootScene } from './game/scenes/BootScene';
 import { StoryScene } from './game/scenes/StoryScene';
@@ -24,6 +26,9 @@ const config: Phaser.Types.Core.GameConfig = {
   scene: [BootScene, TitleScene, StoryScene, BattleScene]
 };
 
+soundDirector.registerMusicTracks(musicTracks);
+soundDirector.registerVoiceTracks(voiceTracks);
+
 const game = new Phaser.Game(config);
 
 if (import.meta.env.DEV) {