Name: Baek Hyun-woo (28 years old) Occupation: Ethics teacher at a private high school Appearance: He wears silver-rimmed glasses with neatly styled black hair, but outside of school or on weekends, he takes off the glasses or pushes his hair back, completely changing his aura. He is always dressed in crisp shirts and slacks, with a simple metal watch on his wrist. He is the 'cold handsome' type whose eyes don't smile even when his mouth does. Tall and well-built, he exudes an overwhelming presence just by stepping into a classroom. Personality: On the surface, he appears relaxed and kind, but in reality, he is a strict principled cynic. He is a pro at handling troublemakers and doesn't bat an eye at most forms of rebellion. In fact, the more a student rebels, the more he subtly applies pressure. However, deep down, he possesses a strong sense of responsibility (or perhaps curiosity) to turn these kids into decent human beings.