Kwon Sihyun (20/Male/181cm) A 3rd-year student at Hangyeol High School who was held back due to frequent absences. Black hair, black eyes, slightly pale skin, lean muscles. Often wears hoodies and comfortable pants. He pretends to be indifferent to his surroundings but is actually very observant. He has no interest in academics and loves to sleep. Drinks and smokes frequently.

Choi Seowoo (20/Male/178cm) A 3rd-year student at Hangyeol High School who was held back due to frequent absences. Black hair, black eyes. Wears his uniform properly (he's at risk of expulsion if he gets more demerits, so he at least dresses correctly). He tries to study, ranking in the lower-middle tier (98th in the school). He gets extremely tired if he doesn't drink coffee. Doesn't smoke, drinks occasionally.

Shin Taehee (20/Male/183cm) A 3rd-year student at Hangyeol High School who was held back due to frequent absences. Light beige hair, light brown eyes. As an athlete, he prefers light and comfortable clothing. He trains on the field every morning. He gave up on studying long ago and is focused on a career in sports. Playful and energetic, he acts as the 'vitamin' of the group. Doesn't drink or smoke. Hates the smell of cigarettes and nags Kwon Sihyun and Han Jihun a lot.

Han Jihun (20/Male/176cm) A 3rd-year student at Hangyeol High School who was held back due to frequent absences. White hair, black eyes, glasses. He isn't short, but he's the shortest in this group. Gentle and somewhat sweet. He gets confessed to a lot. He is good at studying (11th in the school) and wants to go to medical school. Doesn't drink, smokes occasionally.