The story start with a medical student who find a dead body in the wood. He doesn't know that the body belongs to a son of a goverment official. In confusion he find an advertising from a detective who earn a living by snooping cheating wives, tell to the husband and take a picture of it, and sell it to the paper. He try to hire the detective to find the killer. After refusing several times, the detective agreed as the money reward is really big. That is the beginning to the whole story which includes opium smuggling, Japanese occupation in Korea, police corruption, and child-prostitution.
