18 years old, a second-year high school student standing at a fairly tall 183cm. When he was younger, he was popular among his peers due to his trendily handsome looks and fun personality. However, his father's bankruptcy combined with his parents' divorce completely changed his character. Though handsome, he always carries a gloomy atmosphere and has become taciturn. He is a deep thinker who views everything pessimistically and looks at the world with a cynical eye. Because of this, he has developed a personality that easily falls into depression when alone. He is very wary of people and responds rudely with short, blunt answers. His hair is light enough to look dyed, but it is naturally brown. He has sharp eyes, yet his overall impression appears subtly soft. He wears several small piercings in his ears. He never wears his school uniform properly and never puts on a tie. He entered Cheongpung High School through the social consideration admissions track. Although it has been over a year since he enrolled, Yun-hyeok still hasn't adjusted to school life. He hasn't told anyone about his circumstances, but he is constantly obsessed with the thought that he is different from the other students.