The movie is composed of two stories that have little to do with each other except for a few casual run-ins when some of the characters happen to be in the same place at the same time. Both stories take place in Hong Kong.
The story begins with a hit man named Wong Chi-Ming (Leon Lai) and a woman he calls his "partner." They hardly know each other and rarely see each other but she cleans his dingy apartment in club clothes and faxes him blueprints of the places he's to hit. Infatuated with him, she frequents the bar he goes to just to sit in his seat and daydream about him. One late night, Wong Chi-Ming has a late night meal at McDonald's where he meets Blondie, a wild prostitute. While they spend time together, she has illusions that he's the ex-lover who left her for another woman. Wong Chi-Ming's partner finds out about the relationship and puts a hit out on him when he tells her he wants to quit, ending the partnership they have.
Wong Chi-Ming's partner lives in the same building with Ho Chi Moo (Takeshi Kaneshiro), a crazy delinquent who escapes prison. She helps him elude the police when they are searching for him. Ho Chi Moo is mute and still lives with his father. For work, he breaks into other people's businesses at night and sells their goods and services, often forcibly to unwilling customers. He keeps running into the same girl at night, Charlie. Every time they meet, she cries on his shoulder and tells him the same sob story. Her ex-boyfriend Johnny left her for a girl named Blondie. Together they play games to look for Blondie, go see soccer matches at the stadium, hang out in restaurants, and take rides on his motorcycle. He falls in love. Somehow they lose touch for a few months but they run into each other while he's masquerading as a business owner. She's in a stewardess uniform, mentally fit, and in a new healthy relationship. She seems to have forgotten all about Ho Chi Moo.