Universal Private Detective Agency is a small detective agency with only three staff, including President Huang Ruosi (Xu Guanwen). Because the business is not salty and Huang Ruosi is stingy and mean, the staff puffer fish (Xu Guanying) and Jiqi (Zhao Yazhi), in particular, the former has suffered a lot. Li Guojie (Xu Guanjie), who used to work in a soda factory, was fired by his boss because he was lazy at work. Dressed in kung fu, he came to omnipotence to apply for a job. Huang Ruosi refused to hire him at first, but then he saw that he did have two brushes, and his salary was naturally harsh. Before Li Guojie came, Huang Ruosi partnered with puffer fish to detect nothing more than flirtatious, theft, and fraud. Not every one of these cases could be solved, and the process of detection was often full of embarrassment, far from being perfect. But at that time, Hong Kong society had a clear view. After he came, the cooperation of the three men was the same. What is even more fatal is that they are often mistaken for lawbreakers by detectives (Wu Yaohan). In several medium-sized cases, especially when the 80-year-old man's wife (Lu Huizhi) had an affair with someone (Wu Yaohan), Li Guojie showed stronger working ability than Huang Ruosi and was more favored by clients. One day, Huang Ruosi and Li Guojie were entrusted to come to a house that had previously been threatened by robbers.