Here are some good Korean mystery movies: 7 Deadly Sins (2007): Directed by the famous Korean director Park Chan-Wook, it is a classic Korean crime film about a serial killer. [2]<<The Great Detective>>(2014): Directed by the famous director Li Zaijun, the film tells the story of a great detective and a physicist, combining suspense, reasoning, and sci-fi elements. The Signal (2010): Directed by the famous Korean director Lee Jae-gyun, the film tells the story of a group of people who receive a strange phone call. It is a very thrilling suspense film. 4 Murder Memories (2002): Directed by the famous Korean director Kang Hyong-chul, the film tells the story of a policeman recalling a murder case in the past. It is a very classic Korean crime film. The Temptation of the Wolf (2006): Directed by the famous Korean director Cho Bohyun, the film tells the story of a police officer investigating a missing person case. It combines suspense, reasoning, and horror elements. These are some of the Korean mystery movies that I personally think are very good. I hope you will like them!