Another motiveless murder occurs, and Ha Young realizes it has eerie similarities to other cases.

Ha Young interviews Yong Chul as he believes that criminals have a better understanding of each other.

Another brutal murder occurs in Changeui-dong, and Ha Young wants to join Tae Gu from the Special Crime Squad.

Ha Young finally finds out who the culprit is. He joins hands with the Special Crime Squad to search his home.

Ha Young and Young Soo interview Cho Hyun Gil. Then, a series of brutal murders occur in Gangnam and Jongno.

Another senior citizen was murdered in Hwanghwa-dong, and Ha Young and Young Soo head to the crime scene.