許冠文
The film revolves around the exploits of a detective agency in Hong Kong called Mannix Private Detective Agency. It is headed by private detective Wong Yeuk-sze (Michael Hui) with his emotionally drained assistant Puffy (Ricky Hui). Meanwhile, Lee Kwok-kit (Samuel Hui), a kung fu expert, who works at a Vitasoy plant factory and spends most of the time doing kung fu tricks to impress a girl, ultimately loses his job. Seeking to find another line of work, Lee attempts to joins Wong's detective agency. Despite Lee's impression with his kung fu talent which involves his snatching trick, Wong was not impressed. Then, as it appears that Lee would not get the job, Wong discovers that his wallet was missing and was presumed stolen by one bystander who bumped into them, which led to a scene where Wong fights the thief in the kitchen using sausage nunchaku as a weapon. Wong's onslaught backfires, and just as the thief walks away, Lee intercepts him and recovers the wallet, thus impressed Wong to hire him for the job. In truth, the wallet was in Wong's possession the whole time; they attacked an innocent bystander and stole his wallet.