Detective Mok is a very smart detective with a high IQ, but he has asthma and sometimes appears slow and weak. When solving one of his cases, Mok meets insurance agent Wai. She mistakes him for a pervert who has been photographing women in public toilets, leading to some hilarious misunderstandings. Soon after that case is solved, Wai is accused of shoplifting and then becomes the prime suspect in the murder of her boss. Mok proves her innocence in both cases, but at first, she still can't stand him. Later they become friends, but there is still conflict between them because Mok is always broke, so when they go out, Wai has to pay. Wai's job is not easy, and Romeo, the leader of a rival insurance team, makes it a lot harder. Romeo leads the men's team, and Wai leads the women's team, and the competition between the men and women never ends.