After months of fighting over the interests of the casino, the two major gangs in Macau, the Hung Hing Gang and the I-Ying Gang, decided to make peace. Unexpectedly, at this time, it was reported in the underworld that the leader of the Hung Hing Gang, Broken Tooth Wah, had hired an outside killer for a high price of 5 million and was preparing to assassinate the leader of the I-Ying Gang, Gao Laozhong. In order to ensure Gao Laozhong's safety and prevent the world from being in chaos again, Broken Tooth Wah sent his capable subordinate, Achen (Tony Leung), who is also a corrupt policeman, to stop it. The bald killer Yaodong (Lau Ching Wan) and the mysterious woman Afeng (Maggie Shiu) often haunt Achen and constantly cause trouble for him. It turns out that Yaodong is a super killer sent by Mr. Hung, the boss behind the gang, to smash the Hung Hing Gang and the I-Ying Gang. His killing methods are very sophisticated and ruthless. After some arrangements, Yaodong created a situation where Broken Tooth Wah and Gao Laozhong both died at the hands of Achen, but his fate is not in his own hands.