Master Q and Potato fail the job interview in a school, they then go to find Wog for revenge. But Wong has already retired, so he gives Master Q a secret pouch. Fung is a CID. He is in love with Miss Cheung. But Cheung's mother, the District Concilor, is against it. Uncle Kam (a celebrity) believes in some crooks that Fung is going to be the head of the police force in the future. Kam wants to bribe him under his wing for business in the future. Master Q and Potato carelessly knock over Fung and Miss Cheung and they lose their memory. Kam takes this chance to bring Fung to his place and take him in as an adopted son. Master Q and Potato keep Miss Cheung in the office then go for a job interview in the school again. One joke leads to-another. Master Q and Potato become friends with Fung after that Fung stalks Miss Cheung everybody. But Cheung can't remember a thing, so she refuses Fung and tells him to leaves her alone. Fung finds the keys of Chung's boyfriend, and asks his people to tell Miss Cheung her boyfriend's address. Fung and Kam come to the harbour to kill Shing. On the other hand, Master Q, Potato and Miss Cheung come to help Fung. Fung and Cheung recover their memory during the chaos......