In 2019, the cold-blooded shot of jewelry robbery robber Chen Zuyao changed the lives of four mobile police officers. Five years later, among the four policemen, only Guan Zhixuan remained in the mobile unit; Xu Guoxian quit the police force and joined the gang... Zhixuan and his partner Su Guowei led the new members of the mobile unit to assist the anti-gangster inspector Peng Yingqi in arresting drug dealers. Zu Yao was bent on revenge against the unscrupulous drug lord known as the "King of West Kowloon". Later, Zu Yao succeeded in revenge, but it did not bring peace to West Kowloon. Evil forces from all sides are on the rise. In order to maintain social peace, the West Kowloon anti-gangster group and mobile units deal with gangsters and engage in fierce battles every day!