diff --git a/B09_Estimation/draft/B09_Draft_Print_Drawings_Source.py b/B09_Estimation/draft/B09_Draft_Print_Drawings_Source.py
index b3bc11872..2d05d08b7 100644
--- a/B09_Estimation/draft/B09_Draft_Print_Drawings_Source.py
+++ b/B09_Estimation/draft/B09_Draft_Print_Drawings_Source.py
@@ -11,6 +11,7 @@ B07 화면과 같은 TS 를 Node 로(`B09_Draft_Print_Drawings_Node.ts` · CLAUD
 from __future__ import annotations
 
 import asyncio
+import json
 import logging
 import subprocess
 from pathlib import Path
@@ -76,9 +77,12 @@ async def b07_drawing(project_id: UUID, drawing_id: str) -> dict[str, Any]:
     from B07_DesignDetail.B07_DesignDetail_Router import get_design_drawing
 
     response = await get_design_drawing(project_id, drawing_id)
-    if not hasattr(response, "drawing"):
-        raise ValueError(f"B07 도면 「{drawing_id}」 을 읽지 못했습니다.")
-    return response.model_dump()
+    if hasattr(response, "drawing"):
+        return response.model_dump()
+    # 계획평면도 파생 저장본(508-3c) = 그린 응답 JSON 그대로(Response) — 오류 JSONResponse 와 구별
+    if getattr(response, "status_code", None) == 200 and response.media_type == "application/json":
+        return json.loads(response.body)
+    raise ValueError(f"B07 도면 「{drawing_id}」 을 읽지 못했습니다.")
 
 
 async def section_detail(project_id: UUID, route_id: int) -> dict[str, Any] | None:
diff --git a/resources/tester/test_543_print_plan_stored_copy.py b/resources/tester/test_543_print_plan_stored_copy.py
new file mode 100644
index 000000000..c9a4d02ea
--- /dev/null
+++ b/resources/tester/test_543_print_plan_stored_copy.py
@@ -0,0 +1,35 @@
+"""B09 인쇄 도면 — B07 계획평면도 파생 저장본(Response JSON 그대로)도 읽음 · 오류 응답은 400 글."""
+
+from __future__ import annotations
+
+import asyncio
+import json
+from uuid import uuid4
+
+import pytest
+from fastapi import Response
+from fastapi.responses import JSONResponse
+
+from B07_DesignDetail import B07_DesignDetail_Router as b07
+from B09_Estimation.draft import B09_Draft_Print_Drawings_Source as source
+
+DRAWING = {"entities": [{"type": "Line"}], "layers": []}
+
+
+def _read(monkeypatch, response):
+    async def fake(project_id, drawing_id):
+        return response
+
+    monkeypatch.setattr(b07, "get_design_drawing", fake)
+    return asyncio.run(source.b07_drawing(uuid4(), "plan_terrain"))
+
+
+def test_저장본_Response_JSON_을_읽음(monkeypatch):
+    body = json.dumps({"id": "plan_terrain", "drawing": DRAWING, "confirmed": False})
+    got = _read(monkeypatch, Response(content=body.encode(), media_type="application/json"))
+    assert got["drawing"] == DRAWING and got["confirmed"] is False
+
+
+def test_오류_응답은_읽지_못함(monkeypatch):
+    with pytest.raises(ValueError, match="plan_terrain"):
+        _read(monkeypatch, JSONResponse(status_code=404, content={"message": "없음"}))