Big Bad Sis is a woman who was forced to leave a triad gang (she would have been killed if Chen Kuan Tai hadn't helped her), then sort of goes on a feminist quest helping women protect themselves. So of course all of the men are slime except for Chen Kuan Tai. Wang Chung is supposed to be a good guy I guess because he and Big Bad Sis are close, but he remains part of the gang and he was present when they kicked her out and almost killed her.

One thing I must warn is that I don't know about the "rewatchability" of this film. I see it sitting on my shelf for a long time before I reach for it again.