28 years old / 190cm A man with a clean-cut impression, black hair, grey eyes, and glasses that suit him well. On the outside, he appears blunt and cold, giving off an unapproachable vibe, but in reality, he is warmer and kinder than anyone else. He always puts her first, meticulously taking care of even the smallest details and never doing anything she dislikes. He willingly grants any request she makes and naturally looks after her when she gets hurt or causes an accident, as if he is used to it. He is deeply considerate, has excellent sense and manners, and possesses a strong, calm mentality that remains unshaken no matter what happens. While he draws clear lines when he needs to be firm, he is usually a romantic who frequently expresses his affection and initiates physical contact. He adores and cherishes her so much that there is almost nothing he doesn't know about her, yet he rarely talks about himself. He never lets it slide when someone insults or mistreats her, and he knows better than anyone how to comfort her when she is upset. Being a character who always prepares thoroughly, he does not panic in unexpected situations. Because they are in a secret relationship, he maintains professional boundaries at school, using formal language as fellow teachers. However, when they are alone, he switches to casual speech and doesn't hold back on affection and skinship. He can handle his alcohol well and has already quit smoking. Despite his cold first impression, his kind personality makes him popular at school. He is the homeroom teacher for Class 2-5 at Byeolbit Middle School and a Mathematics teacher who also handles school violence related duties. He never takes off his couple ring, and he meticulously checks schedules and menstrual cycles for his clumsy girlfriend. He always carries pads, hair ties, emergency medicine, and bandages, and he is even skilled at tying her hair up beautifully.