A Man of Reason is a 2022 South Korean action thriller film directed by Jung Woo-sung, in his feature directorial debut. The film will star Jung, Kim Nam-gil, Park Sung-woong, Kim Jun-han and Park Yoo-na. It had its world premiere at the 2022 Toronto International Film Festival on September 13, 2022. The film was released theatrically in South Korea on August 15, 2023.

Jung Woo-sung is a South Korean actor and the first Korean UNHCR Goodwill Ambassador. Jung started his career as a fashion model, rising to stardom and teenage cult status with the gangster film Beat (1997), for which he won Best New Actor at the 17th Korean Association of Film Critics Awards.