In order to combat increasingly serious crimes, the mainland police, at the request of the Hong Kong government, dispatched three police officers, Xiang Dong (played by Xu Jinjiang), Jingsheng (played by Lin Guobin), and Guo Xuejun, to land on Hong Kong Island as stowaways. While in Hong Kong, Cheng Sir of the Hong Kong Police Department served as the direct leader, and local detective Da Da (played by Man Ziliang) assisted in handling the case. ...