This has to be one of the best murder films ever made as well as one of South Korea's films and is based on the true story of a South Korean serial killer and his string of murders of women from the same area. The police are unable to catch him and the film gets darker with every killing. The performances by the leading actors are brilliant as well as an excellent support cast. It's hard not to notice it's only a film, but it still has the power to grip the viewer up to the very end. Worth buying or renting in my opinion and can leave the viewer very pleased by it.