The movie is set during the Japanese invasion of China. The story is told from the perspective of Gao - a soldier seeking revenge from the Japanese. He is trying to assassinate the visiting Japanese commander. In the process of plotting such scheme, he had a chance encounter with a local Mafia, lead by its charismatic leader Fang. Fang has a band of followers, including his own sister. Fang have rescued many of the members of the band and formed a life-long friendship with them. When Gao realizes that he could use the help of Fang's band, he sets up a scheme to be captured by Fang on purpose. When Fang finds out - he is extremely angry and almost kills Gao. Gao is saved by Fang's sister after she see how he fared during an interrogation. Gao later redeems himself by saving Fang and all of his band when a bank robbery goes wrong. From there on, Gao partners with Fang to take down the Japanese chief in command. Pi Fu in Chinese means a commoner, and this is a movie about friendship, loyalty and brotherhood.