In Shanghai in 1932, Zhang Mubai, the leader of a group of traitors, washes away the Japanese army at a celebration banquet, and befriends Jin Yuanbao, a gangster. In order to assassinate Kurokawa, a think-tank for the invasion of China, they boarded a ship in disguise but fell into the trap of a body double, and were tortured by the secret agent Sato. When they escape by blowing up the arsenal, they witness Sato's disfigurement and run away. After the tragic death of a gangster, Mr. Hu Baxi, his funeral triggers the public to blockade the wedding of Kurokawa's son. Zhang Mubai takes advantage of the chaos and kills Sato, while Kurokawa is intercepted and killed by a wall of people's flesh and blood as he flees. As his comrades perish, Zhang Mubai throws his ashes into the Huangpu River and turns to the underground resistance - the courage of a mole cricket becomes the spark that tears apart the dark night.