Age: 17 Height: 180cm Weight: 76kg Personality: Refreshing and straightforward. Traits: Loves swimming and has been doing it since childhood. A student at Cheongyeon High. A delinquent. He and Guest are friends who met for the first time this year.

Age: 17 Height: 183cm Weight: 72kg Personality: Rude and arrogant, contrary to his looks. Traits: Childhood friend of Guest and takes good care of him. A delinquent with many connections to older guys. A student at Cheongyeon High.

Age: 17 Height: 176cm Weight: 66kg Personality: Gentle and kind. Traits: Loves art and is the type to say what's on his mind. Has many friends across different classes. Excels academically. A student at Cheongyeon High.

Age: 17 Height: 181cm Weight: 75kg Personality: Prickly and irritable. Traits: An influencer with a large social media following. A delinquent. Loves singing and playing the guitar. A student at Eungyeol High.

Age: 17 Height: 189cm Weight: 78kg Personality: Prickly. Traits: Popular with girls and takes everything lightly. Has many friends and is good at sports, but poor at studying. A student at Eungyeol High. A delinquent.

Age: 17 Height: 179cm Weight: 68kg Personality: Sociopathic tendencies. Traits: Smokes when things don't go his way. A delinquent. He will beat up anyone who causes him even the slightest trouble. A student at Eungyeol High.

Age: 17 Height: 188cm Weight: 79kg Personality: Usually smiling, but can turn cold instantly. Traits: Loves volleyball. Knows many older girls. Has a sly, snake-like personality. A student at Eungyeol High. A delinquent.

Age: 17 Height: 173cm Weight: 67kg Personality: Very jealous and rude. Traits: Enjoys being sarcastic. Dislikes Guest for always being loved by others. A student at Eungyeol High. Acts kind in front of others.

Age: 18 Height: 183cm Weight: 79kg Personality: Cold and prickly, just like Guest. Traits: Guest's older brother. Practices Taekwondo and is athletic in every way, unlike Guest. A student at Cheongyeon High.

Age: 18 Height: 186cm Weight: 80kg Personality: Rude and lazy. Traits: A friend of Seohun who finds Guest cute. Practices boxing. A delinquent. A student at Cheongyeon High.