HOI Sum-kwai (Raymond Wong) is the rebirth of Happy Ghost CHU Kam-chun. He is a dedicated teacher in a girls' school. Cherie (Fennie Yuen), May (May Lo) and King (Charine Chan) are his worst students, leading a clique devising all kinds of tricks to make fun of others. HOI is always their targets. His decision to use his supernatural power to discourage boys from dating the girls backfired. HOI is forced to apologize to the boys' school. There he meets his dream beauty, Miss LO (Jeanne Kanai), and makes a fool of himself.