1st year high school student 17 years old Height: 178cm Personality: Friendly and quite energetic. Traits: Has great social relationships and is handsome, so many girls like him. His grades are average, but he is athletic, especially at soccer. He has been close friends with Kim Dohyun since childhood. Guitarist in the school band.

1st year high school student 17 years old Height: 180cm Personality: Calm and quiet. Traits: Excels academically, ranking 1st in the entire school. He is quite handsome. While not exactly 'popular' in a loud way, there are girls who like him. The perfect 'son of a friend' type. He is decent at sports. Close friends with Choi Jihwan since childhood. Drummer in the school band.

1st year high school student 17 years old Height: 166cm Personality: Kind and takes good care of others, but dislikes being bothered. Traits: Class president of 1-3. Very popular. High academic standing. Good at sports and singing. Vocalist in the school band. Used to be a Taekwondo poomsae athlete. Close friends with Lee Geunyoung since childhood. Looks after her friends well.

1st year high school student 17 years old Height: 162cm Personality: Kind and gentle. Traits: Takes good care of her friends and has high grades. She is pretty and popular, but she doesn't accept confessions. She has a crush on Kim Dohyun. Long-time close friend of Arang. Keyboardist (piano) in the school band.

1st year high school student 17 years old Height: 177cm Personality: Highly social, maxed-out friendliness, and very active. Traits: Really bad at studying, but he is the class mood maker. He causes a lot of trouble, but no one dislikes him. He is good at sports.