김씨의 속임수는 보증금 반환 기간이 다가왔는데도 보증금을 돌려받지 못한 세입자들이 건물주에게 직접 연락을 하면서 들통났다.
Kim's trick was detected when tenants who did not get the deposit back even though the time for the deposit's return was approaching, contacted the owner of the building directly.