Long Lao Si (Eric Tsang) is a gangster who secretly embezzled 120 million yuan of public funds and was preparing to elope abroad with his lover, Ah Shan. This incident caused an internal fight among the four gang kings and triggered a bloody case. Inspector Mi (Lin Xue) was ordered to investigate, but this man was timid by nature and perfunctory. Gang elder Uncle Chai and junior Fa Zai (Shawn Yue) witnessed all this and felt strange and suspected that there was a reason. Fa Zai's lover Xiao Ling (Evan Wong) was always worried, afraid that he would get into trouble, and advised him not to get involved. The only remaining king (Roy Cheung) suspected that Long Lao Si was the mastermind behind the scenes, so he sent his men to investigate and killed Fa Zai's friends. His brother came to persuade Fa Zai to hide, but unfortunately died, and Xiao Ling was also killed by mistake. Fa Zai was extremely angry, and at this time Uncle Chai, who raised him, was also involved in the case. Fa Zai struggled to rescue him, and the two escaped from the clutches. Long Lao Si's attempt to elope failed, and he was plotted against by his wife and adopted son Peter. At the critical moment, Uncle Chai and Fa Zai happened to rush in, which led to a little-known underworld secret...