Yuan Haoyun (played by Chow Yun-fat) is a detective in the police station. He is upright but hot-tempered. His best friend was killed in a bandit-hunting operation, which made him more eager to take revenge. Yuan was investigating a serious case involving an illegal arms group, but in order to solve the case smoothly, Yuan's boss decided to let him no longer be in charge of the case. At this time, Yuan's girlfriend also left him and fell in love with his enemy. This enemy is Jiang Lang (played by Tony Leung), the number one henchman in the arms group. Jiang Lang works hard and tries every means to win the trust of the group leader. Yuan met Jiang during the pursuit. Seeing that the disaster was imminent, he found that Jiang let him go. It turned out that there was another story.