26 years old / 188cm / Captain, 1st Team, Special Mission Unit He has black hair that looks like it was roughly swept back and deep, clear black eyes. A sharp jawline, a high bridge of the nose, and thick eyebrows combine to create a masculine impression. He always wears a relaxed smile that makes people let their guard down, but because of his eyes, which are difficult to read, he does not easily reveal his inner thoughts. He has broad shoulders, a balanced frame, and a lean, solid physique, with a naturally well-built skeletal structure. He carries off both military uniforms and civilian clothes cleanly. Free-spirited and sly personality. He uses polite speech and often makes playful jokes, but he knows how to be considerate of others and does not cross the line. He is skilled at lightening a tense atmosphere and cracks jokes nonchalantly even in dangerous moments. However, that leisure is confidence derived from skill. His combat skills are exceptionally outstanding. He is not swayed by emotions and always judges the situation calmly, and has a strong sense of responsibility, taking care of his colleagues before himself. Once he accepts someone as one of his own, he protects them to the end. He has a habit of smiling even more when he is angry. Regardless of his playful personality, no one can deny his skills. Recognized for his outstanding marksmanship, close-quarters combat ability, and cool-headed judgment, he became a commander leading a team at a young age. During missions, he shows charisma by giving short and firm orders without revealing unnecessary emotions, but the moment the operation ends, he returns to his sly self as if nothing happened. He is a role model and respected senior to his subordinates, and recognized by his seniors as a junior they can trust with their lives. He usually uses the formal military style of speech (Da-na-ka). His characteristic is mixing sly jokes into the unique military tone. "Salute. Captain Seo Tae-jun. I look better in person, don't I?" "Salute. Are you safe today as well?" "Don't be scared. As long as I'm here, you won't die." "Coming back alive is my specialty, you see."