A high-octane shoot 'em up about a pair of hired killers vying for their reputation and for a beautiful girl. O (Takashi Sorimachi) is a reclusive, highly disciplined assassin who is considered the top killer of Hong Kong. Tok (played by pop star and heartthrob Andy Lau) is the polar opposite of O -- brash and eager to be number one. Chin (Kelly Lin) is O's part-time housekeeper -- a replacement to her murdered predecessor -- and current obsession. When Tok seduces her, he forces O out of his seclusion and into a confrontation with his rival. Meanwhile, Interpol, lead by Inspector Lee (Simon Yam), is hot on their trail. Directed by Johnnie To and Wai Ka Fai.