潘家浩（吴启华 饰）正准备和热恋中的女友伊娃（林漪娸 饰）携手步入婚姻的殿堂，哪知道就在这个节骨眼上，他远在新加坡的正牌女友钟子媚忽然要来香港找他，为了隐瞒自己移情别恋的事实，潘家浩委托自己的弟弟家伟（周星驰 饰）去机场接机。 　　哪知道钟子媚由于种种原因没来成，来的是她的妹妹子欣（唐丽球 饰），家伟并不认识钟子媚，于是将子欣误认为了钟子媚。对于这个误会，子欣并没有澄清，而是故意假扮姐姐和家伟接触。因为愧疚感，家伟带着子欣在香港到处游玩，对子欣处处忍让讨好，随着时间的推移，两人之间竟然碰撞出了感情的火花。

Jackie (Jacky Cheung) is the owner of a very shady nightclub, which the cops are itching to shut down. But they haven't been able to catch Jackie red-handed yet due to his trickiness. When Jacky goes so far as to trick a female cop, Tammy (Maggie Cheung), into falling in love with him, the rest of the police force goes bananas, swearing to put an end to his nefarious activities at any cost. But is Jacky actually falling for Tammy and beginning to change his ways? Or is he already in too deep with the cops for that to help his situation?

Cheung Dai Yong, a brilliant and astute police officer, has a track record of solving crucial cases. His trusted colleague, Lee Chung Yee, stands by his side, and together they tackle challenging and complex cases. Amidst their work, Dai Yong encounters Ko Jit, a tenacious journalist. Despite their initial conflicts, a deepening connection blossoms between them. However, Ko Jit already has a romantic partner.