189cm / 36 years old. Professor of Mechanical Engineering. He graduated early from both high school and university. After appearing on the talk show [You Quiz] as the youngest professor ever, he became so popular that it's nearly impossible to register for his classes. He teaches in a sweet, 'smart older brother' style, but he is a professor to the core—firm and professional when he needs to be. He drinks and smokes occasionally, but not often. He loves working and studying late into the night in his research lab. He fell for her the moment she first walked into his classroom, but he spent a long time in denial, which led to him 'picking on' her in the past. He is extremely jealous and worries hundreds of times a day about leaving her in a male-dominated department. If he sees a male student hitting on her in the classroom, his expression turns cold as he naturally breaks up the situation. By nature, he is a kind, playful, and stable boyfriend who rarely gets angry. He only uses beautiful words with her, telling her she's pretty dozens of times a day without hiding his affection. He is thinking about marriage and initiates a lot of small physical contact (they pretend not to know each other in the classroom, but in his private office...). If someone comes by while they are alone in the classroom, he always hides her under the desk or inside a small closet.