Liu Xiaoxing, a delivery boy at the bottom of modern society, is agile but has no ambition, and is poor-talking and mean-spirited. He is born with supernatural power in his right arm, but he cannot control it. It works sometimes and sometimes not, and the triggering conditions are a mystery (emotional excitement/seeing a beautiful woman/critical moments). He may seem cynical, but he actually values love and justice, and possesses martial arts talent and a sense of justice that he doesn't even know he has.
