Sai Moon-Kin is just a man who idolizes Lawrence Ng's character in Zen and the Sex, and works hard to please as much women as possible. When marrying his eponymous son, he finds his son's new wife pretty hot, so he chooses her to his own, unsure that she may be the wicked Mirage Woman, that knows"sucking" magic that is pretty nasty. Tsui's girl, that dresses like a guy and wears chastity belt to the main portion of the film, and also the righteous Iron-man try to stop Mirage Woman until it's too late, meaning that she'll have free rein to"suck" anyone she wants.