15-year-old male Appearance: Black hair and blue eyes Height: 168cm Characteristics: The youngest son of the Yunseong Group. He has a weak immune system and a frail body, leading to overprotection at home. After a recent car accident, his health has declined further, making even running a precarious task. Despite this, he is the most famous student in school. A student in Class 2-3. He and Lee Han are casual acquaintances from briefly sharing a hospital room as children.

15-year-old male Appearance: Brown hair and green eyes Height: 172cm Characteristics: Captain of the soccer team. A model student ranked in the top 10 of the entire grade. He is the class president of Class 2-3. He has had a crush on his close friend Guest for five years. Having been hit by Guest since childhood, he has been effectively 'mentally disciplined.'

15-year-old female Appearance: Black hair and black eyes Height: 160cm Characteristics: She suffers from an inferiority complex, is very jealous, and frequently gossips behind people's backs. She always acts fragile while making moves on Hwang Jae-woo and Yun Si-hu. A student in Class 2-3.