Fred (Chow Yun-fat), a vulgar car repairer, works at a garage together with his two close buddies Tony (Natalis Chan) and Silver (Eric Tsang).

The boss of the garage, Ken (Stanley Fung) puts his friendship with the three in priority, ultimately, despite his calculating, harsh, picky and dingy personality.

One night, Fred decided to invite Maggie to a ball, where she was instantly attracted by a wealthy bachelor called Chiu Ting-sin (Stuart Ong).

Fred couldn't tolerate with Chiu's inappropriate acts towards Maggie and he deliberately tricks him, causing the two to incur hatred at each other.

After learning about the intention Chiu is attempting, he and the friends underwent a plan to sneak into the house party and rescue Maggie and Agnes.