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index fc5c68a..6b748e3 100644
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index 5b3c959..9dac892 100644
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index ec7aece..3f23a84 100644
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index 2bb8037..ea51ea1 100644
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index 1c672e0..241b28a 100644
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diff --git a/Assets/Prefabs/Tower/Tower10.prefab b/Assets/Prefabs/Tower/Tower10.prefab
index 2a55f28..7e10591 100644
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diff --git a/Assets/Prefabs/Tower/Tower11.prefab b/Assets/Prefabs/Tower/Tower11.prefab
index fcfcfb1..b8d92a5 100644
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diff --git a/Assets/Prefabs/Tower/Tower2.prefab b/Assets/Prefabs/Tower/Tower2.prefab
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diff --git a/Assets/Prefabs/Tower/Tower7.prefab b/Assets/Prefabs/Tower/Tower7.prefab
index 011909d..0c4ea0b 100644
--- a/Assets/Prefabs/Tower/Tower7.prefab
+++ b/Assets/Prefabs/Tower/Tower7.prefab
@@ -100,10 +100,12 @@ GameObject:
   m_Component:
   - component: {fileID: 6092032662981689228}
   - component: {fileID: 3024920159226660218}
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   - component: {fileID: 2441707223561240999}
   - component: {fileID: 378133264392226747}
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+  - component: {fileID: 3880321387241188331}
+  m_Layer: 7
   m_Name: Tower7
   m_TagString: Untagged
   m_Icon: {fileID: 0}
@@ -141,7 +143,7 @@ MonoBehaviour:
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   InScenePlacedSourceGlobalObjectIdHash: 0
   DeferredDespawnTick: 0
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   ActiveSceneSynchronization: 0
@@ -151,32 +153,6 @@ MonoBehaviour:
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@@ -214,3 +190,72 @@ NavMeshObstacle:
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   m_Center: {x: 0, y: 2, z: 0}
   m_TimeToStationary: 0.5
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diff --git a/Assets/Prefabs/Tower/Tower8.prefab b/Assets/Prefabs/Tower/Tower8.prefab
index 930ab0b..5dc9a79 100644
--- a/Assets/Prefabs/Tower/Tower8.prefab
+++ b/Assets/Prefabs/Tower/Tower8.prefab
@@ -100,10 +100,12 @@ GameObject:
   m_Component:
   - component: {fileID: 1262766073322889693}
   - component: {fileID: 6013227135396217395}
-  - component: {fileID: 6819441593374584406}
   - component: {fileID: 9211585859645762342}
   - component: {fileID: 1097109601016292624}
-  m_Layer: 0
+  - component: {fileID: 6819441593374584406}
+  - component: {fileID: 1118957636877758540}
+  - component: {fileID: 8797158074662636706}
+  m_Layer: 7
   m_Name: Tower8
   m_TagString: Untagged
   m_Icon: {fileID: 0}
@@ -141,7 +143,7 @@ MonoBehaviour:
   GlobalObjectIdHash: 4259369348
   InScenePlacedSourceGlobalObjectIdHash: 0
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-  Ownership: 1
+  Ownership: 0
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   ActiveSceneSynchronization: 0
@@ -151,32 +153,6 @@ MonoBehaviour:
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@@ -214,3 +190,72 @@ NavMeshObstacle:
   m_CarveOnlyStationary: 1
   m_Center: {x: 0, y: 2, z: 0}
   m_TimeToStationary: 0.5
+--- !u!114 &6819441593374584406
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diff --git a/Assets/Prefabs/Tower/Tower9.prefab b/Assets/Prefabs/Tower/Tower9.prefab
index 9e3669a..48d9463 100644
--- a/Assets/Prefabs/Tower/Tower9.prefab
+++ b/Assets/Prefabs/Tower/Tower9.prefab
@@ -10,10 +10,12 @@ GameObject:
   m_Component:
   - component: {fileID: 7752742402654965604}
   - component: {fileID: 2100218699898094647}
-  - component: {fileID: 5946113811413841135}
   - component: {fileID: 7455967066004482479}
   - component: {fileID: 4388971622930339705}
-  m_Layer: 0
+  - component: {fileID: 5946113811413841135}
+  - component: {fileID: 7760341804248730016}
+  - component: {fileID: 8099337083081135545}
+  m_Layer: 7
   m_Name: Tower9
   m_TagString: Untagged
   m_Icon: {fileID: 0}
@@ -51,7 +53,7 @@ MonoBehaviour:
   GlobalObjectIdHash: 4259369348
   InScenePlacedSourceGlobalObjectIdHash: 0
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-  Ownership: 1
+  Ownership: 0
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@@ -61,32 +63,6 @@ MonoBehaviour:
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@@ -124,6 +100,75 @@ NavMeshObstacle:
   m_CarveOnlyStationary: 1
   m_Center: {x: 0, y: 2, z: 0}
   m_TimeToStationary: 0.5
+--- !u!114 &5946113811413841135
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diff --git a/Assets/Scripts/BuildingManager.cs b/Assets/Scripts/BuildingManager.cs
index d7d9c79..2c229f2 100644
--- a/Assets/Scripts/BuildingManager.cs
+++ b/Assets/Scripts/BuildingManager.cs
@@ -22,6 +22,10 @@ namespace Northbound
         private List<Building> placedBuildings = new List<Building>();
         private List<BuildingFoundation> placedFoundations = new List<BuildingFoundation>();
 
+        // Level 1 건물 캐시
+        private List<TowerData> _buildableBuildingsCache;
+        private bool _buildableCacheDirty = true;
+
         private void Awake()
         {
             if (Instance != null && Instance != this)
@@ -41,6 +45,26 @@ namespace Northbound
             );
         }
 
+        /// <summary>
+        /// 건설 가능한 건물 목록 반환 (Level 1만, 캐싱됨)
+        /// </summary>
+        public List<TowerData> GetBuildableBuildings()
+        {
+            if (_buildableCacheDirty || _buildableBuildingsCache == null)
+            {
+                _buildableBuildingsCache = new List<TowerData>();
+                foreach (var building in availableBuildings)
+                {
+                    if (building != null && building.level == 1)
+                    {
+                        _buildableBuildingsCache.Add(building);
+                    }
+                }
+                _buildableCacheDirty = false;
+            }
+            return _buildableBuildingsCache;
+        }
+
         public Vector3Int WorldToGrid(Vector3 worldPosition)
         {
             return new Vector3Int(
diff --git a/Assets/Scripts/BuildingPlacement.cs b/Assets/Scripts/BuildingPlacement.cs
index da7bc3e..6cc00da 100644
--- a/Assets/Scripts/BuildingPlacement.cs
+++ b/Assets/Scripts/BuildingPlacement.cs
@@ -208,7 +208,7 @@ namespace Northbound
         public void SetSelectedBuilding(int index)
         {
             if (index < 0 || BuildingManager.Instance == null || 
-                index >= BuildingManager.Instance.availableBuildings.Count)
+                index >= BuildingManager.Instance.GetBuildableBuildings().Count)
             {
                 Debug.LogWarning($"[BuildingPlacement] 유효하지 않은 건물 인덱스: {index}");
                 return;
@@ -235,19 +235,22 @@ namespace Northbound
 
         private void CreatePreview()
         {
+            // 기존 프리뷰가 있다면 먼저 정리 (누적 방지)
+            DestroyPreview();
+
             if (BuildingManager.Instance == null)
             {
                 Debug.LogWarning("[BuildingPlacement] BuildingManager가 없습니다.");
                 return;
             }
 
-            if (selectedBuildingIndex < 0 || selectedBuildingIndex >= BuildingManager.Instance.availableBuildings.Count)
+            if (selectedBuildingIndex < 0 || selectedBuildingIndex >= BuildingManager.Instance.GetBuildableBuildings().Count)
             {
                 Debug.LogWarning($"[BuildingPlacement] 유효하지 않은 건물 인덱스: {selectedBuildingIndex}");
                 return;
             }
 
-            TowerData data = BuildingManager.Instance.availableBuildings[selectedBuildingIndex];
+            TowerData data = BuildingManager.Instance.GetBuildableBuildings()[selectedBuildingIndex];
             if (data == null)
             {
                 Debug.LogError($"[BuildingPlacement] TowerData is NULL at index {selectedBuildingIndex}");
@@ -262,6 +265,9 @@ namespace Northbound
 
             // 완성 건물 프리팹으로 프리뷰 생성 (사용자가 완성 모습을 볼 수 있도록)
             previewObject = Instantiate(data.prefab);
+
+            // (0,0,0)에 고스트가 보이지 않도록 처음에는 비활성화
+            previewObject.SetActive(false);
             
             // Remove NetworkObject component from preview
             NetworkObject netObj = previewObject.GetComponent<NetworkObject>();
@@ -317,17 +323,19 @@ namespace Northbound
             if (previewObject == null || BuildingManager.Instance == null)
                 return;
 
-            if (selectedBuildingIndex < 0 || selectedBuildingIndex >= BuildingManager.Instance.availableBuildings.Count)
+            if (selectedBuildingIndex < 0 || selectedBuildingIndex >= BuildingManager.Instance.GetBuildableBuildings().Count)
                 return;
 
-            TowerData data = BuildingManager.Instance.availableBuildings[selectedBuildingIndex];
+            TowerData data = BuildingManager.Instance.GetBuildableBuildings()[selectedBuildingIndex];
             if (data == null || data.prefab == null)
                 return;
 
             Ray ray = Camera.main.ScreenPointToRay(Mouse.current.position.ReadValue());
-            
+
             if (Physics.Raycast(ray, out RaycastHit hit, maxPlacementDistance, groundLayer))
             {
+                // Raycast 성공 시 프리뷰 표시
+                previewObject.SetActive(true);
 
                 // Check if placement is valid
                 bool isValid = BuildingManager.Instance.IsValidPlacement(data, hit.point, currentRotation, out Vector3 snappedPosition);
@@ -352,6 +360,11 @@ namespace Northbound
                     renderer.materials = mats;
                 }
             }
+            else
+            {
+                // Raycast 실패 시 (0,0,0)에 고스트가 보이지 않도록 프리뷰 숨김
+                previewObject.SetActive(false);
+            }
         }
 
         private void OnRotate(InputAction.CallbackContext context)
@@ -443,13 +456,13 @@ namespace Northbound
         {
             if (BuildingManager.Instance == null) return;
 
-            if (selectedBuildingIndex < 0 || selectedBuildingIndex >= BuildingManager.Instance.availableBuildings.Count)
+            if (selectedBuildingIndex < 0 || selectedBuildingIndex >= BuildingManager.Instance.GetBuildableBuildings().Count)
             {
                 Debug.LogWarning($"[BuildingPlacement] Invalid building index: {selectedBuildingIndex}");
                 return;
             }
 
-            TowerData data = BuildingManager.Instance.availableBuildings[selectedBuildingIndex];
+            TowerData data = BuildingManager.Instance.GetBuildableBuildings()[selectedBuildingIndex];
             if (data == null || data.prefab == null)
             {
                 Debug.LogError($"[BuildingPlacement] TowerData or prefab is null at index {selectedBuildingIndex}. Please run 'Northbound > Populate Towers from Prefabs' and update BuildingManager.");
@@ -581,7 +594,7 @@ namespace Northbound
                 return;
             }
 
-            TowerData selectedData = BuildingManager.Instance.availableBuildings[selectedBuildingIndex];
+            TowerData selectedData = BuildingManager.Instance.GetBuildableBuildings()[selectedBuildingIndex];
 
             // Check affordability
             var coreResourceManager = CoreResourceManager.Instance;
@@ -629,7 +642,7 @@ namespace Northbound
             Ray ray = Camera.main.ScreenPointToRay(Mouse.current.position.ReadValue());
             if (Physics.Raycast(ray, out RaycastHit hit, maxPlacementDistance, groundLayer))
             {
-            TowerData selectedData = BuildingManager.Instance.availableBuildings[selectedBuildingIndex];
+            TowerData selectedData = BuildingManager.Instance.GetBuildableBuildings()[selectedBuildingIndex];
 
                 // Check affordability
                 var coreResourceManager = CoreResourceManager.Instance;
diff --git a/Assets/Scripts/BuildingQuickslotUI.cs b/Assets/Scripts/BuildingQuickslotUI.cs
index db43264..d88693c 100644
--- a/Assets/Scripts/BuildingQuickslotUI.cs
+++ b/Assets/Scripts/BuildingQuickslotUI.cs
@@ -1,5 +1,4 @@
 using System.Collections.Generic;
-using Unity.Netcode;
 using UnityEngine;
 using UnityEngine.InputSystem;
 using TMPro;
@@ -188,12 +187,12 @@ namespace Northbound
             }
             slotButtons.Clear();
 
-            // 모든 건물 슬롯 생성 (제한 없음)
-            var buildings = BuildingManager.Instance.availableBuildings;
-            
-            for (int i = 0; i < buildings.Count; i++)
+            // Level 1 건물만 슬롯 생성 (건설 모드에서는 기본 건물만 표시)
+            var buildableBuildings = BuildingManager.Instance.GetBuildableBuildings();
+
+            for (int i = 0; i < buildableBuildings.Count; i++)
             {
-                CreateSlot(buildings[i], i);
+                CreateSlot(buildableBuildings[i], i);
             }
         }
 
diff --git a/Assets/Scripts/Buildings/Blacksmith.cs b/Assets/Scripts/Buildings/Blacksmith.cs
index c6397af..333eaeb 100644
--- a/Assets/Scripts/Buildings/Blacksmith.cs
+++ b/Assets/Scripts/Buildings/Blacksmith.cs
@@ -37,7 +37,7 @@ namespace Northbound
 
         public string GetInteractionPrompt()
         {
-            return "[F] 업그레이드";
+            return "[F] Upgrade";
         }
 
         public string GetInteractionAnimation()
diff --git a/Assets/Scripts/EnemyAIController.cs b/Assets/Scripts/EnemyAIController.cs
index bfcca17..7b766a6 100644
--- a/Assets/Scripts/EnemyAIController.cs
+++ b/Assets/Scripts/EnemyAIController.cs
@@ -180,7 +180,7 @@ namespace Northbound
                 }
             }
 
-            // 1. Player 감지 (코어로 가는 도중에도 Player를 타겟팅)
+            // 1. Player 감지 (코어로 가는 도중에도 Player/건물을 타겟팅)
             GameObject detectedPlayer = DetectTarget();
             if (detectedPlayer != null)
             {
@@ -189,20 +189,7 @@ namespace Northbound
                 return;
             }
 
-            // 2. 코어로 가는 경로가 '완전(Complete)'한지 확인
-            // NavMesh가 갱신되었다면 에이전트는 즉시 Complete 상태가 됩니다.
-            if (_agent.hasPath && _agent.pathStatus == NavMeshPathStatus.PathComplete)
-            {
-                if (!_hasSetCoreDestination)
-                {
-                    _agent.SetDestination(_core.GetNavMeshPosition());
-                    _hasSetCoreDestination = true;
-                }
-                // [중요] 길이 열렸으므로 아래의 장애물 탐지 로직을 아예 실행하지 않고 리턴!
-                return;
-            }
-
-            // 3. 길이 막혔을 때(Partial)만 아주 좁은 범위에서 장애물을 찾음
+            // 2. 경로 상의 장애물(건물) 감지 - 경로 상태와 관계없이 확인
             GameObject obstacle = DetectObstacle();
             if (obstacle != null)
             {
@@ -211,8 +198,8 @@ namespace Northbound
                 return;
             }
 
-            // 4. 경로가 유효하지 않을 때만 재설정
-            if (!_agent.hasPath || _agent.pathStatus == NavMeshPathStatus.PathInvalid)
+            // 3. 코어로 가는 경로 설정
+            if (!_hasSetCoreDestination || !_agent.hasPath || _agent.pathStatus == NavMeshPathStatus.PathInvalid)
             {
                 _agent.SetDestination(_core.GetNavMeshPosition());
                 _hasSetCoreDestination = true;