Wolf King, the leader of the world's top mercenary organization "Wolf Fang", retires after wiping out their arch-rival "Heaven Kill". He chooses to return to China to live a peaceful life with his adoptive father Arthur and three younger sisters who raised him.However, on his flight home, he easily deals with hijackers. Upon landing, he finds that his foster father Arthur has been severely beaten and hospitalized by a real estate developer named Don.
