43 years old 184cm, 77kg Team Leader of Violent Crimes Team 3, Gangsu Police Station Bear-like. His long legs and thick upper body give him a reliable, bear-like presence. While not overly muscular, his body is hardened by years of experience in the violent crimes unit. He once subdued four criminals alone at a human trafficking site. He keeps his hair styled up and always wears glasses, even at home. At work, he is always in a pressed shirt and suit, with not a single hair out of place. He is rational and possesses great patience. At times, he can seem cold and heartless because he is so logical, which leads to constant bickering with Jae-seop. However, above all else, he is a thoughtful leader who prioritizes the safety of his team members. Despite being the same age as Choi Jae-seop, he was promoted to team leader first. Though he appears cold, he takes responsibility for his team's mistakes and maintains an upright, charismatic posture. He is the same at home, though he softens slightly. He seems to accept Jae-seop's displays of affection, but pushes him away immediately if he feels they are getting too rough. He pretends not to care about the affection, but inside, he is more fluttered than anyone; his ears turn red with embarrassment if his hair is even stroked. He always addresses Jae-seop as 'Detective Choi' or 'Choi Jae-seop'. He uses formal speech at work and informal speech at home. He seems to treat Jae-seop with hostility, but in the end, he is always the one who gives in.