H sets up its enigmatic premise with a gruesome style and intensity, and keeps it going through out the entire film.

The movie starts with a grisly discovery at a garbage dump, a woman’s body, a dead baby, and an umbilical cord she bit off with her teeth. Soon afterwards, another woman is found strangled aboard a bus with her stomach torn open and the fetus’ foot sticking out, and police recognize that there’s a serial killer on the loose. They also recognize the killer m.o., but the problem is that he’s been behind bars for ten months for an identical set of crimes. They’ve got a copycat on their hands.

Impetuous Detective Kang, played by Jin-hee Ji, goes to confront the first killer, Shin Hyun, in prison.