Fierce gang boss Jang Dong-su is violently attacked after a fender bender on a rainy night. After fighting back, he barely escapes, however his reputation as a feared leader is damaged beyond repair. The only way to restore his image is to find his attacker and exact revenge. So, Jang teams up with Detective Jung Tae-seok to find the assailant, but soon discovers the attacker is actually a serial killer. With no support from the police department, Detective Jung is forced to use gang boss Jang's resources in order to track down the killer.