diff --git a/M02_MasterTemplete/M02_MasterTemplete_Combo_Store.py b/M02_MasterTemplete/M02_MasterTemplete_Combo_Store.py
index d328a891..acd75edf 100644
--- a/M02_MasterTemplete/M02_MasterTemplete_Combo_Store.py
+++ b/M02_MasterTemplete/M02_MasterTemplete_Combo_Store.py
@@ -84,6 +84,17 @@ def find(key: str) -> dict[str, Any] | None:
     return next((r for r in _rows_at(_file(key)) if str(r.get("키")) == key), None)
 
 
+def where(key: str) -> tuple[str, str | None] | None:
+    """키의 층 · 주인 — ("system", None) · ("company", "7") · ("personal", "7/42") · 모르면 None."""
+    key = str(key or "")
+    got, path = _HEAD.match(key), _file(key)
+    if key.startswith(MASTER) or path is None or not got:
+        return ("system", None) if key.startswith(MASTER) else None
+    if got[1] == "C":
+        return ("company", got[2])
+    return ("personal", f"{path.parent.parent.parent.name}/{got[2]}")  # {회사}/{사용자}/templates
+
+
 def names() -> dict[str, str]:
     """지금 층이 쓸 수 있는 조합 키 → 이름(마스터 · 회사 · 개인)."""
     out: dict[str, str] = {}
diff --git a/M02_MasterTemplete/M02_MasterTemplete_Router_Combos.py b/M02_MasterTemplete/M02_MasterTemplete_Router_Combos.py
index fb4ea592..078e58ba 100644
--- a/M02_MasterTemplete/M02_MasterTemplete_Router_Combos.py
+++ b/M02_MasterTemplete/M02_MasterTemplete_Router_Combos.py
@@ -67,6 +67,16 @@ def get_all(session: Session = Depends(verify_session)) -> list[dict]:
     return out
 
 
+@router.get("/combos/key/{key}")
+def get_by_key(key: str, session: Session = Depends(verify_session)) -> dict:
+    """키 하나(어느 층이든 · 그 층 읽기 권한) — `{layer, owner, 판, combo, 줄, …}`."""
+    got = combos.where(key)
+    if got is None:
+        raise HTTPException(status_code=404, detail=f"없는 조합 「{key}」")
+    layer, owner = got
+    return {"layer": layer, "owner": owner, **_call(_root(session, layer, owner), combos.one, key)}
+
+
 @router.get("/layers/{layer}/combos")
 def get_combos(layer: Layer, owner: str | None = None, session: Session = Depends(verify_session)):
     return _call(_root(session, layer, owner), combos.listing)
diff --git a/resources/tester/test_m02_combo_layers.py b/resources/tester/test_m02_combo_layers.py
index e16f7a39..6a71f801 100644
--- a/resources/tester/test_m02_combo_layers.py
+++ b/resources/tester/test_m02_combo_layers.py
@@ -223,6 +223,13 @@ def test_세_층_목록_고르기_남의_층_403_갈라_낸_것은_그_층에(wo
     assert [r["키"] for r in all_[1]["줄"]] == [uc] and [r["키"] for r in all_[2]["줄"]] == [up]
     assert combos.find(uc)["이름"] == "회사 조합" and combos.find(up)["이름"] == "내 조합"
     assert combos.find("UP42-999999") is None and combos.find("엉터리") is None
+    by_key = me.get(f"/api/m02/combos/key/{up}").json()
+    assert (by_key["layer"], by_key["owner"], by_key["combo"]["키"]) == ("personal", "7/42", up)
+    assert me.get(f"/api/m02/combos/key/{uc}").json()["owner"] == "7"
+    assert me.get("/api/m02/combos/key/UP42-999999").status_code == 404
+    world["session"]["company_id"] = 8  # 다른 회사 사람 — 남의 회사 조합은 못 봄
+    assert me.get(f"/api/m02/combos/key/{uc}").status_code == 403
+    world["session"]["company_id"] = 7
 
     column = me.post(
         "/api/m02/layers/personal/tree",