Jet Li stars in this kung-fu vehicle directed by Corey Yuen Kwai. Though a committed father and husband, Kung (Li) is a mainland undercover cop assigned to a case so sensitive that he dare not tell what he does to those he loves the most. Ordered to infiltrate the crime syndicate run by the psychotic Po Kwong (Yu Rongguang), Kung befriends Po's associate Darkie (Blackie Ko Shou-liang) and helps him escape from jail. In gratitude, Darkie smuggles Kung in Hong Kong and introduces him to Po. During an exchange between the crime lord and a second shady customer who is hawking liquid explosives, a shootout ensues. Kung takes policewoman Fong Yat-wah (Anita Mui Yim-fong) hostage and flees the scene. After he saves her from falling to her death, Fong suspects that Kung is more than the average thug. She journeys to China to investigate the matter, and learns that indeed he is an honest cop. Unfortunately, some of Po's associates also go to China and learn the same thing.