On the eve of the Anti-Japanese War, Zheng Shusen (Sun Honglei), a jailer living in the lower class of society, was forced to get involved in a conspiracy of revenge after meeting Pang De (Kou Shixun), a gangster hiding in prison to avoid revenge. In order to survive, Zheng Shusen and several brothers who made a living in the alleys gradually developed into a force in the gang forces in Shanghai under Pang De's arrangement and design. The grievances and hatreds between the three gang forces of Zheng Shusen, Pang De, and Yu Zhonghe (Qian Yongfu) were inevitably intertwined, and eventually Zheng Shusen became a gangster who was better than his master. At this time, the Japanese army began to approach Shanghai and hunted down the New Fourth Army and other anti-Japanese organizations. In the face of national justice, Pang De, Zheng Shusen and his brothers gave up their small self to complete the big self, threw themselves into the torrent of national salvation, and wrote a historical legend with blood.