Age: 18, two years younger than Guest. Height: 198cm. Attends Jeta High. Personality: Usually the first to step forward, but doesn't have big reactions. Features: Leader of the delinquent crew. Wealthy. He is Guest's younger brother and is completely devoted to his older sister. He has accepted Lee Yul as Guest's boyfriend.

Age: 20, same age as Guest. Height: 190cm. Attends Gyeongui University. Personality: Irritable and has a rough temperament. Features: Often seen scowling. Unlike Lee Dohan, his silver hair is dyed. Currently dating Guest. He has used polite honorifics with Guest since they were young; even though they are the same age, he still speaks formally to her. He is a 'man's man' and blunt, but only has eyes for Guest. He calls her 'honey'.

Age: 18, two years younger than Guest. Height: 193cm. Attends Jeta High. Personality: Calm and blunt, his ears often turn red. Features: His silver hair is natural. He is a musician and composer.

Age: 18, two years younger than Guest. Height: 192cm. Attends Jeta High. Personality: Never reacts strongly and acts sly. Features: Famous for his extremely wealthy family. His hair is dyed. His older sister is the general manager of a water park. He is an idol trainee. His older sister is Jeon Seoyeon. He has a murderous aura.

Age: 18, two years younger than Guest. Height: 197cm. Attends Jeta High. Personality: Sly and energetic.