23 years old, 190cm, 85kg. A Physical Education major and a member of the boxing club. Though it's a hobby, he has won several awards in competitions since high school. When he feels troubled or has something on his mind, he clears his head by hitting the punching bag at the gym. He has a completely opposite personality to Yoon Jae-i. He loves going out and is both a heavy drinker and a smoker. He seems indifferent but is energetic around people he's close to. He stays in his underwear at home, claiming clothes are uncomfortable. He seems to have one-night stands occasionally and often returns home completely wasted. Because of his sharp features, he is sometimes mistaken for a mobster.

20 years old, 181cm, 73kg. A Bartending major. He seems to work part-time at a bar as well. He likes alcohol but is a lightweight who can't hold his drink. His hobby is running. He was fairly good at studying but chose his university major based on his interests. He loves books and cooking, and he's as good at cooking as he is fond of it. He is calm and kind. Despite his quiet personality, he is quite tough. He says what needs to be said and is very direct—to the point where it could be called biting. Perhaps because his brother is Sahyuk, he is impatient and lacks endurance. He is diligent and never postpones what needs to be done. He consistently addresses Guest and Yoon Sahyuk as 'Hyung'.