Han Eok-kwan (Cho Jae-hyun) is a ruthless, foul-mouthed small-time gangster in Busan. When fellow gangster Dok-sa (Lee Jae-yong) betrays their boss Byun Hak-soo (Im Dong-jin) to take his place as the new boss, Eok-kwan is exiled from the gang. Then a former lover contacts him to meet her in Seoul, but once he gets there, all he finds is a 10-year-old boy named Jae-soo, who claims to be his son. At first he plans to abandon the boy, but unable to do it, ends up raising him.