A cab driver named Lung, played by Maggie Cheung, develops an unhealthy obsession with news reporter Jenny Tung, who is played by another actress, Yuen. He tells her stories about things he sees while driving, and eventually they get to meet. Despite his feelings for her, he is met with a certain amount of hostility. Someone is on the loose, and it's a violent killer, and you know they're going to be involved in some capacity.