Crime lord Yoonshik takes a little boy named Jiwoon as collateral when the child's father hangs himself from debt. Eight years later, the boy is working as Yoonshik's bodyguard. When the boss gets locked behind bars, Jiwoon is sent to work for another middle boss in the city's red-light district. There, Jiwoon meets a mysterious mute, Soohan, and everything just might change for him.