Fung Man-Gwong

Powerful Four boasts an all-star cast and chronicles the rise of four semi-corrupt Hong Kong police detectives during the late 1960s.

Building Inspector Tony (Tony Leung Ka Fai) investigates an old abandoned building in a deserted plant site and falls victim to a restless demon, who wants to resurrect into Tony's body. However, the spirit of a young woman (Rosamund Kwan) suddenly appears, saves Tony, and accidentally sucks some of his life force, thereby, sharing his feelings and emotions. The ghost falls in love with Tony, but he wants to use her to help him woo his gorgeous colleague (Ellen Chan).

David died a virgin, and the Doomsday Book says a virgin ghost has no right for reincarnation until he deflowers a human virgin. So David assumes the human shape and goes after Yen. Yen's boyfriend finds out that David is a ghost and warns her, but she doesn't listen. It's now up to him to protect her--against her will--from the sneaky and sex-crazed ghost of David.