diff --git a/M02_MasterTemplete/M02_Sangeun_Calc.py b/M02_MasterTemplete/M02_Sangeun_Calc.py
index 19373f1b1..0ea7b5e10 100644
--- a/M02_MasterTemplete/M02_Sangeun_Calc.py
+++ b/M02_MasterTemplete/M02_Sangeun_Calc.py
@@ -222,6 +222,7 @@ def calc_doc(doc: Any, given: dict | None = None) -> dict[str, Any]:
     whole = m01.loaded()[1]
     try:
         clean = sd.clean(doc, None, whole)
+        _check_refs(clean, refs.here())  # 저장 전 문서도 위 층만 · 있는 문서 · 순환 422
         me = refs.ref_id({"층": refs.here()[0], "주인": refs.here()[1], "키": clean["키"]})
         got = run(clean, whole, given, trail=(me,))
     except sd.DocError as e: