Happy Ghost IV

A group of college kids discovers the remains of an ancient evil warlord from an old cave and brings it to their dormitory, which ultimately awakens the warlord's ghost. It is seeking to avenge the woman responsible for his death many years ago, who has since reincarnated as college professor Hong Sam Kwai's snobby girlfriend, Annie. With Kwai and Annie endangered, Kwai's reincarnated spirit, Stewart Pik, takes over to save him and Annie and attempt to defeat the demon.