Memoir of a Murderer is a 2017 South Korean mystery thriller film directed by Won Shin-yun. It is based on a bestselling novel by Kim Young-ha. The film stars Sul Kyung-gu and Kim Nam-gil in the lead roles, with Kim Seol-hyun and Oh Dal-su in the supporting roles. The filming began in late 2015. The film was released in South Korean theatres on 6 September 2017.