To combat rising violent crimes, the Police Chief asks Detective Oh Goo Tak to form a team consisting of criminals. Detective Oh Goo Tak is currently suspended from the police force for using excessive force. Detective Oh Goo Tak gathers team members: Park Woong Cheol who is a gangster, Lee Jung Moon who is the youngest serial killer with extraordinary intelligence and Jung Tae Soo who is a contract killer. Also, Police Inspector Yoo Mi Young joins the team. She tries to have the guys work as a team by dealing with them rationally and sometimes emotionally.