Chang-do, a wandering orphan, captures the eye of crime syndicate middle boss Jae-young Chang and enters the gang. One day, Jae-young receives orders to kill Chang-do but refuses. In retaliation, Jae-young meets his end at the hands of the gang, witnessed by Chang-do. Fueled by revenge for his mentor's death, Chang-do launches attacks against the crime syndicates. As he uncovers ties to another crime syndicate boss behind the scenes, Chang-do uses his knowledge to sow chaos and strike back.