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A serial murder case occurred in a secret room in a county at the junction of three provinces, and powerful families became the targets. When the investigation reaches a deadlock, detective Jin Sijiu discovers clues from the symbols on the victim. Behind the serial killings is another forgotten murder. When the law stops at the statute of limitations, is revenge the only way to justice?

Before retiring, an old detective was involved in a case of corpse dismemberment in a secret room. In order to find the real culprit, he had to go deep into the mystery. Dismemberment of corpses occurred in a locked rental house. Everyone involved has their own hidden agendas, and a weird atmosphere permeates everywhere. When the truth was about to be revealed, the suspect committed suicide mysteriously, but the murders did not stop. The police suspected that the real murderer was still at large, but when they stepped into the maze, the truth was unexpected...