diff --git a/Assets/Scripts/Mechanics/GameOptimizer.cs b/Assets/Scripts/Mechanics/GameOptimizer.cs
index 32bbd28..a6a9f1d 100644
--- a/Assets/Scripts/Mechanics/GameOptimizer.cs
+++ b/Assets/Scripts/Mechanics/GameOptimizer.cs
@@ -102,13 +102,20 @@ namespace Platformer.Mechanics
                         {
                             var pos = new Vector3Int(x, y, 0);
                             if (!levelTilemap.HasTile(pos)) continue;
+
+                            // BT49 — Tile asset의 m_ColliderType=None = 배경 의도 (예: tree·cloud) = 자동 분류 제외
+                            var tileAsset = levelTilemap.GetTile<UnityEngine.Tilemaps.Tile>(pos);
+                            if (tileAsset != null && tileAsset.colliderType == UnityEngine.Tilemaps.Tile.ColliderType.None) continue;
+
                             Vector3 worldPos = levelTilemap.CellToWorld(pos);
                             bool aboveThreshold = worldPos.y >= airThresholdY;
                             bool isSmallAir = !aboveThreshold && IsSmallAirPlatform(levelTilemap, pos, MAX_PLATFORM_WIDTH);
                             if (!aboveThreshold && !isSmallAir) continue;
                             var tile = levelTilemap.GetTile(pos);
+                            // BT49 — Foreground 이동 시 Tile asset 원래 colliderType 존중 (None=배경, Sprite=발판)
+                            var srcColliderType = (tileAsset != null) ? tileAsset.colliderType : UnityEngine.Tilemaps.Tile.ColliderType.Sprite;
                             fgTilemap.SetTile(pos, tile);
-                            fgTilemap.SetColliderType(pos, UnityEngine.Tilemaps.Tile.ColliderType.Sprite);
+                            fgTilemap.SetColliderType(pos, srcColliderType);
                             levelTilemap.SetTile(pos, null);
                             if (aboveThreshold) movedHigh++;
                             else movedSmall++;
@@ -121,6 +128,31 @@ namespace Platformer.Mechanics
                 }
             }
 
+            // BT49 — Foreground Tilemap 자체에 이미 그려진 배경 Tile (예: tree·cloud — Tile asset colliderType=None) ColliderType=None 복원
+            // BT47이 SetColliderType(Sprite) 무차별 강제 → 배경 Tile도 발판처럼 충돌 → Tile asset metadata 존중으로 정정
+            if (fgTilemap != null && fgTc != null)
+            {
+                int restored = 0;
+                var fgBounds = fgTilemap.cellBounds;
+                for (int x = fgBounds.xMin; x <= fgBounds.xMax; x++)
+                {
+                    for (int y = fgBounds.yMin; y <= fgBounds.yMax; y++)
+                    {
+                        var pos = new Vector3Int(x, y, 0);
+                        if (!fgTilemap.HasTile(pos)) continue;
+                        var fgTileAsset = fgTilemap.GetTile<UnityEngine.Tilemaps.Tile>(pos);
+                        if (fgTileAsset == null) continue;
+                        if (fgTileAsset.colliderType == UnityEngine.Tilemaps.Tile.ColliderType.None)
+                        {
+                            fgTilemap.SetColliderType(pos, UnityEngine.Tilemaps.Tile.ColliderType.None);
+                            restored++;
+                        }
+                    }
+                }
+                if (restored > 0) fgTc.ProcessTilemapChanges();
+                Debug.Log($"[BT49-Background] Foreground tile colliderType=None restored: {restored} (배경 Tile 충돌 차단)");
+            }
+
             Debug.Log($"[BT48-DropThrough] Layer16 applied={applied} levelKeptLayer0={levelKept} excluded={excluded} total={allColliders.Length}");
             Debug.Log($"[BT48-DropThrough] appliedSamples=[{string.Join(", ", appliedNames)}]");
         }