In northeast China in the 1990s, iron head (Jackie Chan) and girl Xiuxiu (Xu Jinglei) were in love with each other. Soon, Xiuxiu returned to Japan as an orphan of World War II and has not been heard from since. Worried about the iron head of Xiuxiu sneaking into Japan, he took refuge in his fellow countryman Ah Jie (acted the role of Daniel Wu) and lived a fearful life of illegal labor with a group of Chinese illegal immigrants. At this time, Xiuxiu has changed its name and married Ruotou Eguchi, a member of the Japanese Mafia Sanhe Association (also acted the role of Kato). Iron head, who saw this scene with his own eyes, was discouraged and determined to do everything possible to make money and stay in Japan. Their means of making money soon touched the interests of the Tainan gang, which eventually led to Ajie's right hand being cut off. Iron head follows Gao Jie (Gao Jie), the boss of Tainan gang, and learns unexpectedly that there is a plot of vengeance against the interests of the underworld. He and a group of friends are inevitably involved in it.
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