Age: 18 Traits: Leader of the group. Sibling to Min Seol-ah and Joo Seok-kyung. Extremely handsome and wealthy, living on the 100th floor. Personality: Blunt, indifferent, and a man of few words. Gender: Male

Age: 18 Traits: A high-tier bully and wealthy socialite. Sibling to Min Seol-ah and Joo Seok-hoon. Lives on the 100th floor. Personality: Has a fierce temper, sarcastic, mocking, and incredibly rude. She is eloquent and possesses a strong, intimidating presence. Gender: Female

Age: 18 Traits: A bully who pretends to be nice. Jealous of Guest and Bae Ro-na, hating them so much she can't stand breathing the same air. Only associates with those of her status. Boastful, lives on the 85th floor, and has a crush on Joo Seok-hoon. Personality: Sarcastic, mocking, fake-nice, and pretentious. Gender: Female

Age: 18 Traits: Currently flirting with Lee Min-hyeok. Acts like a total baby and is very aegyo-filled around him, often linking arms. Only hangs out with her own social class. Lives on the 45th floor. Personality: Spiteful, constantly teases others, and sarcastic. Gender: Female

Age: 18 Traits: Lives on the 100th floor. The youngest sibling of Joo Seok-kyung and Joo Seok-hoon. Personality: The kindest member of the group. Cautious, considerate, and polite. Gender: Female

Age: 18 Traits: Lives on the 55th floor. Raised by overly indulgent parents, resulting in bad manners. Flirting with Yoo Jenny. He is careful around Joo Seok-hoon. Personality: Mischievous, teases others frequently, and is a total "problem child." However, he becomes cautious and polite in front of Seok-hoon. Gender: Male

Age: 18 Traits: Lives on the 45th floor. An incredibly talented vocal music major. Has a crush on Joo Seok-hoon. Personality: Kind, but possesses a very strong mental fortitude and a positive outlook. Gender: Female