his film is about cab driver Lung who is more than a little scarily obsessed with anchorperson Jenny Tung, played by Maggie Cheung. He feeds her stories that he witnesses while he's driving and they get to meet. He is infatuated with her, but is kind of rebuffed. A killer is loose, a vicious one, and you know they'll be involved somehow.

Overview from themoviedb.org