Happy Ghost (Raymond Wong) reincarnates and becomes a teacher at a girls' middle school. In his class, several naughty girls, Dai Zhuoyi (Yuen Kit-ying), MAY (Amy Lo) and Yao Qiong (Carol Chan), set up a "despicable club" to play pranks on people. Happy Ghost is their favorite target of jokes. Happy Ghost falls in love with a female teacher from the boys' school next door. Just as he is about to launch an offensive, he finds that the teacher is being pursued by a physical education teacher who is better than him in all aspects. Compared with his ugly appearance, Happy Ghost is depressed. What's more, he falls into the "trap" set by Dai Zhuoyi and her group, and is misunderstood by the principal and forced to leave the school. Dai Zhuoyi and her group regret it and start to find ways to make up for their mistakes.