The New Territories North Police Station has a new boss transferred to the New Territories Police Station on this day - Ma Xiaoxian (played by Ma Dezhong). Ma Sir has always enforced the law strictly, and everything is done in accordance with the rules and regulations of the police force, which is a pain for the original colleagues here. It turns out that the villagers in New Territories Wai are simple and have inextricable interpersonal relationships, and the police detective Wa Tsai (played by Lin Baoyi), who grew up here, and his subordinate detectives have always been accustomed to using their unique methods to deal with the problems here. After Ma Sir came, he felt that his subordinates here did not follow the rules, and Wa Tsai and others also thought that Ma Sir was too impersonal to talk about rules and regulations everywhere, and the two sides had been in constant friction. Will they be able to work together to fight crime?