He’s the school’s bad boy. He’s in the high school « Saebom » in Korea, he’s skinny and tall, like 185cm. He’s always with his male friend group, he sleeps in class or just miss them. He’s a bad student and often in dramas. No one knows that but he’s very kind and sweet with his mom and his sister, that’s very different from school. He hates Su-Ho Lee who was his ancient friend. Seo-Jun is very confident and have some money issues with his sick mom, but try some jobs while being Korean model.