Wang Zhenyang is about to take office as the Commissioner of Police of Hong Kong, and his appointment is bound to deal a major blow to the mixed underworld of Hong Kong. The Hou family is the largest gang in Hong Kong. Its boss, Hou Wenhua (played by Wei Junjie), threatened to let Wang Zhenyang know how powerful they are within a month. In order to revive the glory of the underworld, the police sent Senior Inspector Huang Jiahui (played by Zheng Jiaying) of the Intelligence Department to protect Wang Zhenyang's safety at all costs. Hou Wenhua teamed up with Thai drug lords to try to monopolize the drug market in Southeast Asia. Their conspiracy was discovered by policewoman Rita (played by Sririta Jensen). After investigation, all these criminal actions have an indisputable relationship with the wealthy businessman Zheng Kun. Captain Feng Zhiwei (played by Alex Fong), the captain of the West Kowloon Serious Crime Unit, met a woman named Pang Hui (played by Yoyo Mung), who was actually the beloved of Hou Wenhua. Under the careful design of Hou Wenhua, Feng Zhiwei was wrongly accused of killing a police officer. At the same time, Feng Zhiwei also discovered that there were undercover gangsters in the police station.