Chan Yan Kin is a scientist who had invented a cloning machine. He successfully cloned his son Tony Leung. Tony Leung plays both himself and his clone distinguishable only by the slightly curly hair on the real Tony. The real Tony is a rotten spoilt brat while his clone is a hardworking and kind person who lives in an orphange (can't remember why he was there). Carina Lau plays the girlfriend of the good Tony but had a brief relationship with the bad Tony when she mistook him for her boyfriend. I can't remember what part Simon Yam and Au Yeung Pui San played but I know they were a couple in the show. Fung Sui Fan plays a computer expert who later joins Chan Yan Kin on his project. Chong Mun Ching is his wife. Basically the story is about how Chan Yan Kin and the rest of the gang try to avoid an evil organizaton from getting their hands at the blueprint for Chan's project, and how the bad Tony makes the good Tony pay for his evil deeds.