Ho Sau, an undercover agent, has been working with Yau, a drug lord, for years, but his job and family are in trouble.
YUM Investigation is a detective agency that specializes in the supernatural. With their new member Kojiro, the agency investigates a developer who dispatches evil spirits to scare away the residents of an old building. When they discover that the spirits were created by a sinister “spirit refiner”, the investigators must use every trick up their sleeves to crack the case.
