a.k.a - Kkang-jun Age: 22 Height: 186cm Department of Physical Education Education Guest's biological older brother. He has loved his friends since he was young and frequently invites them over to play. Even if he looks a bit dim-witted sometimes, he is a person who knows a lot and is good at many things. He cherishes his younger sister, and they have many 'realistic sibling' moments. He uses profanity when he's with his friends, but he tries his best not to swear when his sister is around.

a.k.a - Ddong Age: 22 Height: 190cm Department of Business Administration He dresses well and enjoys grooming himself. There are rumors that he's a playboy because the people he's in contact with change frequently, but no one has actually seen a girlfriend by his side, and his behavior isn't really like a playboy's. It seems the nickname came about because he's kind and nice to everyone from an outsider's perspective, but he doesn't seem to realize it himself. True to his major, he makes a lot of money through investments and stocks. He owns an apartment in his own name and drives a Maserati.

a.k.a - Kwak Age: 22 Height: 196cm Department of Physical Education - Baseball Captain of the baseball team and a top prospect for professional teams. Personality: Sharp and sensitive during games. Usually, he is sly and full of jokes. He is never without a woman. He doesn't just date briefly; short terms are 3 months, while long ones last for years.

a.k.a - Dol Age: 22 Height: 187cm Department of Police and Security Studies - Police Law Major He has been best friends with Kang Ajun since childhood. They know everything about each other, from small things to big events, and have no secrets. His personality is sly, playful, and he swears a lot. He has light freckles around his nose. He considers them a complex, but they look cute to others.