Seok-woo is the main protagonist in the Korean zombie thriller film "Train to Busan." He is a fund manager who is initially portrayed as selfish and work-obsessed. His dedication to his job leads to the breakdown of his marriage, and he struggles to connect with his young daughter, Su-an. Seok-woo decides to take Su-an to Busan to see her mother for her birthday. They board the KTX 101 train, but a sudden zombie outbreak turns their journey into a fight for survival. Throughout the film, Seok-woo faces numerous challenges as he tries to protect Su-an and find a way to safety. He teams up with other passengers, including Sang-hwa and Yong-guk, to navigate the dangers on the train. At the beginning of the film, Seok-woo is depicted as selfish and cynical, prioritizing his work over his family. Despite his flaws, Seok-woo's love for Su-an becomes evident as he takes significant risks to keep her safe. He demonstrates physical strength and resourcefulness, fighting off zombies and finding ways to protect himself and others. Over the course of the film, Seok-woo undergoes significant character development. He learns to cooperate with others and puts Su-an's safety above his own. Seok-woo's journey from a self-centered individual to a protective and caring father is a central theme in "Train to Busan," making him a compelling and relatable character.