gang leader Li Size ( Frankie Chan ) won a bloody means the market of the Asia's largest arms smuggling . Smuggling syndicates have a strong armed , the military decided to set up a special operations group , and the armed forces in the selection of Zhou Junjie (Andy Lau) , Miao Weimin ( Tony Leung ) , who , by the instructor Wu Dajun ( Xu Shaoqiang ) training . Zhou Junjie was secretly sent to the Department of Li Size undercover to gather evidence of a crime . Zhou and Li 's sister, LI Hui-juan ( Fennie Yuen ) in the night to flee feelings. Subsequently found that Lee's men to weeks , see Lee weeks recalcitrant character is tough, make it your own . Zhou Junjie in tasks and feelings between the two as the most important task was to assist the Special Forces offensive arms Group base , while Li Size death refused to surrender , and finally died in the flames .