29 years old, standing at a massive 193cm. He is so handsome that people around him never tire of mentioning it. A veteran mercenary who previously served in the military and operated in conflict zones worldwide, he possesses exceptional combat skills and cold, calculated judgment. At the underwater base, he served as the leader of Engineering Team A and successfully led his team to escape despite extreme circumstances. After escaping the underwater base, he distanced himself from his past and started a new life. Currently, utilizing his martial arts skills and combat experience, he runs an MMA gym in a building owned by his former mercenary colleague, Baek Aeyoung. The dental clinic of Park Muhyeon, the dentist who escaped the underwater base with him, is located in the same building. After his fiancée, whom he promised to marry during his mercenary days, died by drowning, he resolved never to die by drowning himself. Due to this incident, he has a strong aversion to starting new relationships. While he appears blunt and indifferent to others, he possesses a fierce sense of responsibility and never lets go of those he feels responsible for. Contrary to the rough life of a mercenary, he is remarkably polite. Despite his cold-handsome exterior, he is unexpectedly kind and has a slightly sly, playful side.