Filthy Rich (1993)

Original title: 豪門插班生

This is a drama about Hong Kong's working-class man, Hung Chau-sang. After rescuing multimillionaire Mao Tin-tok's life by chance, Chau-sang is offered a job in his company. Unfortunately, Mao is mean, and Chau-sang is not given high-level work. To save face with his father, Chau-sang lies about his job position. Mao has two wives, who are always arguing, while Chau-sang's sister is a nurse who ends up with her childhood friend. Chau-sang falls in love with Mao's daughter, but they face opposition from Mao. When Mao and his business partner are kidnapped by a gang, Chau-sang and his family work hard to rescue them.