diff --git a/Assets/01_Scenes/Hischool_Chapter1.unity b/Assets/01_Scenes/Hischool_Chapter1.unity
index d4d2edc1..d361b738 100644
--- a/Assets/01_Scenes/Hischool_Chapter1.unity
+++ b/Assets/01_Scenes/Hischool_Chapter1.unity
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:eae9d7111bf0e563bdb4d6497b1fad7d020a3eab16d647d44770fda1aea698fd
-size 4031049
+oid sha256:dccc663b8b2c0cdf81b7595c2c2448be4a9d8a2f03a80648381a9a9c2245824c
+size 4036164
diff --git a/Assets/02_Scripts/Communication/Dialog/DialogCondition.cs b/Assets/02_Scripts/Communication/Dialog/DialogCondition.cs
index 2f58bb8e..cbc7eec3 100644
--- a/Assets/02_Scripts/Communication/Dialog/DialogCondition.cs
+++ b/Assets/02_Scripts/Communication/Dialog/DialogCondition.cs
@@ -25,6 +25,9 @@ public class DialogCondition
     [Tooltip("밟으면 이 대화가 비활성화되는 이벤트존 Id들 (하나라도 밟았으면 비활성화)")]
     public List<string> ExcludedZoneIds = new();
 
+    [Tooltip("켜져 있어야 하는 StoryTrigger Id들 (전부 필요). 예: 계약서 서명 트리거")]
+    public List<string> RequiredTriggerIds = new();
+
     // affectionTarget: 호감도 조건을 검사할 캐릭터 (보통 대화를 거는 NPC 자신)
     public bool IsMet(CharacterData affectionTarget)
     {
@@ -52,6 +55,10 @@ public bool IsMet(CharacterData affectionTarget)
             if (!string.IsNullOrEmpty(zoneId) && story.HasTriggeredZone(zoneId))
                 return false;
 
+        foreach (var triggerId in RequiredTriggerIds)
+            if (!string.IsNullOrEmpty(triggerId) && !StoryTrigger.IsActive(triggerId))
+                return false;
+
         return true;
     }
 }
diff --git a/Assets/02_Scripts/Managers/SceneBgm.cs b/Assets/02_Scripts/Managers/SceneBgm.cs
new file mode 100644
index 00000000..d4652396
--- /dev/null
+++ b/Assets/02_Scripts/Managers/SceneBgm.cs
@@ -0,0 +1,55 @@
+using System.Collections.Generic;
+using UnityEngine;
+
+// 씬별 BGM 관리 (이벤트 구동). 씬마다 하나 배치한다.
+// - 씬 시작 시 Default Bgm 재생
+// - EventZone이 발동하거나 StoryTrigger가 켜지는 순간, 그 Id에 매핑된 곡이 있으면 교체 (크로스페이드)
+// - 매핑에 없는 Id는 무시. 나중에 발동한 항목이 이긴다
+// - 대화 전용 BGM(Override) 재생 중이면 곡은 보류됐다가 대화가 끝나면 반영된다
+public class SceneBgm : MonoBehaviour
+{
+    [System.Serializable]
+    public class BgmEntry
+    {
+        [Tooltip("EventZone의 Zone Id 또는 StoryTrigger의 Trigger Id")]
+        public string Id;
+
+        [Tooltip("해당 Id 발동 시 재생할 BGM. 비우면 무음")]
+        public AudioClip Clip;
+    }
+
+    [Tooltip("씬 시작 시 재생할 기본 BGM. 비우면 무음")]
+    [SerializeField] private AudioClip _defaultBgm;
+
+    [Tooltip("존/트리거 Id → BGM 매핑")]
+    [SerializeField] private List<BgmEntry> _entries = new();
+
+    private void Start()
+    {
+        if (SoundManager.Instance != null)
+            SoundManager.Instance.SetDefaultBGM(_defaultBgm);
+    }
+
+    private void OnEnable()
+    {
+        EventZone.OnZoneTriggered += HandleId;
+        StoryTrigger.OnActivated += HandleId;
+    }
+
+    private void OnDisable()
+    {
+        EventZone.OnZoneTriggered -= HandleId;
+        StoryTrigger.OnActivated -= HandleId;
+    }
+
+    private void HandleId(string id)
+    {
+        foreach (var entry in _entries)
+        {
+            if (entry.Id != id) continue;
+            if (SoundManager.Instance != null)
+                SoundManager.Instance.SetDefaultBGM(entry.Clip);
+            return;
+        }
+    }
+}
diff --git a/Assets/02_Scripts/Managers/SceneBgm.cs.meta b/Assets/02_Scripts/Managers/SceneBgm.cs.meta
new file mode 100644
index 00000000..ce3d5b4a
--- /dev/null
+++ b/Assets/02_Scripts/Managers/SceneBgm.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 3a5362edc262af5439945354ddc95802
\ No newline at end of file
diff --git a/Assets/02_Scripts/Managers/SoundManager.cs b/Assets/02_Scripts/Managers/SoundManager.cs
index 79b11e6b..b2876283 100644
--- a/Assets/02_Scripts/Managers/SoundManager.cs
+++ b/Assets/02_Scripts/Managers/SoundManager.cs
@@ -40,7 +40,7 @@ private void Awake()
         }
         else
         {
-            Destroy(gameObject); //이미 인스턴스가 있으면 자신을 파괴
+            Destroy(gameObject); //이미 인스턴스가 있으면 자신을 파괴 (씬마다 놓아도 첫 번째만 남음)
         }
     }
 
@@ -72,6 +72,7 @@ private void Start()
     //기본 BGM 교체 (씬/분위기 전환용). 전용 BGM 재생 중이면 곡은 유지되고 복귀 시 반영됨.
     public void SetDefaultBGM(AudioClip clip)
     {
+        if (_defaultBgm == clip) return;   //같은 곡이면 페이드 재시작 없이 유지
         _defaultBgm = clip;
         if (_overrideBgm == null)
             StartBgmChange(clip);
diff --git a/Assets/02_Scripts/Story/EventZone.cs b/Assets/02_Scripts/Story/EventZone.cs
index 80b8c18d..fae58e2e 100644
--- a/Assets/02_Scripts/Story/EventZone.cs
+++ b/Assets/02_Scripts/Story/EventZone.cs
@@ -1,3 +1,4 @@
+using System;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.Playables;
@@ -29,6 +30,9 @@ public class EventZone : MonoBehaviour
     public static bool IsAnyPlaying => _playingCount > 0;
     private static int _playingCount;
 
+    // 존이 실제로 발동(기록)되는 순간 ZoneId와 함께 호출 (SceneBgm 등에서 구독)
+    public static event Action<string> OnZoneTriggered;
+
     public string ZoneId => string.IsNullOrEmpty(_zoneId) ? name : _zoneId;
 
     // 잠글 때 켜져 있던 프로바이더만 기록해서, 해제 시 원래 꺼져 있던 것까지 켜지 않도록 한다.
@@ -52,6 +56,7 @@ private void OnTriggerEnter(Collider other)
         if (story != null)
             story.RecordZoneTriggered(ZoneId);
         _hasPlayed = true;
+        OnZoneTriggered?.Invoke(ZoneId);
 
         if (_timeline == null)
         {
diff --git a/Assets/02_Scripts/Story/StoryTrigger.cs b/Assets/02_Scripts/Story/StoryTrigger.cs
new file mode 100644
index 00000000..dc33a5c3
--- /dev/null
+++ b/Assets/02_Scripts/Story/StoryTrigger.cs
@@ -0,0 +1,48 @@
+using System;
+using System.Collections.Generic;
+using UnityEngine;
+
+// 씬에 배치하는 수동 트리거. Activate()가 호출되면 켜지고,
+// DialogCondition의 RequiredTriggerIds에서 Id로 조회해 대화 활성화 조건으로 쓴다.
+// 예: 계약서 서명(DrawablePaper.OnSigned) → 이 트리거 Activate → 서명 후 대화 활성화.
+//
+// 주의: 세이브에 기록되지 않는 런타임 상태다 (오브젝트가 비활성/파괴되면 꺼짐).
+// 영구히 남아야 하는 진행은 기존처럼 대화 완료 기록/선택지 Code를 쓸 것.
+public class StoryTrigger : MonoBehaviour
+{
+    [Tooltip("조건에서 참조할 Id. 비워두면 오브젝트 이름 사용")]
+    [SerializeField] private string _triggerId;
+
+    [Tooltip("시작부터 켜진 상태로 둘지")]
+    [SerializeField] private bool _startActivated;
+
+    public string TriggerId => string.IsNullOrEmpty(_triggerId) ? name : _triggerId;
+    public bool IsActivated { get; private set; }
+
+    private static readonly Dictionary<string, StoryTrigger> _registry = new();
+
+    // 트리거가 꺼짐→켜짐으로 바뀌는 순간 TriggerId와 함께 호출 (SceneBgm 등에서 구독)
+    public static event Action<string> OnActivated;
+
+    private void Awake()
+    {
+        IsActivated = _startActivated;
+    }
+
+    private void OnEnable()  => _registry[TriggerId] = this;
+    private void OnDisable() => _registry.Remove(TriggerId);
+
+    // UnityEvent에서 호출 (예: DrawablePaper.OnSigned)
+    public void Activate()
+    {
+        if (IsActivated) return;
+        IsActivated = true;
+        OnActivated?.Invoke(TriggerId);
+    }
+
+    public void Deactivate() => IsActivated = false;
+
+    // 해당 Id의 트리거가 씬에 있고 켜져 있는가 (DialogCondition에서 사용)
+    public static bool IsActive(string id)
+        => _registry.TryGetValue(id, out var trigger) && trigger.IsActivated;
+}
diff --git a/Assets/02_Scripts/Story/StoryTrigger.cs.meta b/Assets/02_Scripts/Story/StoryTrigger.cs.meta
new file mode 100644
index 00000000..f6be180a
--- /dev/null
+++ b/Assets/02_Scripts/Story/StoryTrigger.cs.meta
@@ -0,0 +1,2 @@
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+guid: 3dd49c6ec99ea3543addd745e4737dbc
\ No newline at end of file
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new file mode 100644
index 00000000..d983fbdf
--- /dev/null
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@@ -0,0 +1,789 @@
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