Mu-yeom who became a detecitve for his father, receives news like a nightmare.

Hearing something suspicious about the body of a murder case, Mu-yeom rushes to the crime scene.

It's reported that the first case is the act of Gabdong and there will be a second case of murder.

Mu-yeom is arrested as a criminal, and Yang suggests to compare the DNA of Gabdong and Mu-yeom.

Chief Yang meets Maria and thinks of a girl he met at the scene for a case from a while ago.

Mu-yeom suspects Tae-oh as Gabdong. Tae-oh lets out the story of his dead father to Maria.