You must never tell anyone. If you don't follow it, you die." Kwon Soon-hyang, the owner of the building who suddenly murdered the tenant. Seven years later, he is killed by someone ahead of his surrender. Shin Yeo-ju, a detective who digs up a huge conspiracy and absurdity behind the death of Soon-hyang Kim, a lawyer who gives a clue to the case linked to the death of his own client.