A transnational case stumped the Hong Kong police. At a high-level secret meeting, Inspector Cao (played by Cao Defa) accepted the advice of his subordinates and decided to send non-police personnel to steal precious diamonds from Japanese gangsters. He found his old partner in the Five Lucky Stars as usual, but in the end only Partridge (played by Sammo Hung) agreed to take over. After some screening, they found four more unreliable police officers from the police station, namely: Dog Wanglun (played by Alan Tam), Fat Leopard (played by Zheng Zeshi), Rambo (played by Andy Lau), Band You (played by Chen You) and Li Baojian (played by Lau Nam-kwong). These people's funny and off-line skills are as good as those of the Five Lucky Stars, making more jokes. In order to train them well in a short period of time, Inspector Cao also specially sent the sexy and charming female police officer Yi Pinxiang as a coach. But can this group of lustful guys who only want to take advantage of others finally complete the task successfully?