The leader of the "Zhong Xin Yi" gang, Lian Haolong (played by Sammo Hung), got a son in his old age and held a full moon banquet to entertain the gang members. Although the child was born by his new concubine (played by Zhang Wenqi), Lian Haolong's wife Soso (played by Tian Niu) still appeared like an elder sister-in-law. However, due to the large number of people at the banquet, a riot occurred. When the police and the gangsters confronted each other, the senior inspector Liao Zhizong (played by Danny Lee) of the anti-gang group stepped in to resolve the situation and avoided a bloody battle. His younger brother Lian Haodong (played by Simon Yam) was addicted to gambling, so Lian Haolong deliberately set up a trap to persuade him to stop and talk about brotherhood. After a drug deal worth 300 million yuan was smashed by the police, the fourth uncle (played by Hui Shaoxiong) was kidnapped. The police's anti-gang operation caused Lian Haolong's minions to fall one after another, leaving only the ruthless and skilled Luo Tianhong (played by Wu Jing) to escape death. Female police officer Lei Meizhen (Maggie Shiu) obtained key intelligence by luring the enemy deep into the city, and the police set up a dragnet. At the same time, Lian Haolong also discovered a spy among his accomplices who had been through life and death with him, and this person eventually led to the demise of "Zhong Xin Yi" and Lian Haolong...