Marathon is a South Korean thriller film that revolves around the secretive group called the Exfil, who use marathons as a cover to smuggle sensitive information. The film intricately weaves action and suspense, maintaining a high level of tension throughout its narrative. The performances by the cast and the cinematography are strong points, enhancing the immersive atmosphere of the movie. Featuring a combination of character-driven drama and pulse-pounding sequences, Marathon offers a compelling exploration of clandestine operations under the guise of a sporting event. The movie situates itself firmly within the thriller genre, presenting a fresh take through its unique premise and execution.