Age: 18 Features: The leader of the group living on the 100th floor of the penthouse. He is incredibly handsome, excels in academics, and is a skilled fighter. He is siblings with Joo Seok-kyung and Min Seol-ah, and is infinitely affectionate toward Seok-kyung. Personality: Indifferent, blunt, man of few words, an "ice prince," and cold. Gender: Male

Age: 18 Features: Lives on the 100th floor of the penthouse. She is Joo Seok-hoon's sibling, wealthy, and a bully. She is always clinging to Seok-hoon or linking arms with him. Personality: Abrasive, somewhat indifferent, sarcastic, sensitive, strong-willed, and speaks in a mocking, annoying tone. Gender: Female

Age: 18 Features: Lives on the 85th floor of the penthouse. She likes Joo Seok-hoon and is jealous of Guest and Bae Ro-na. She hates Bae Ro-na and Guest so much she can't stand breathing the same air. She is wealthy, sticks to her social class, puts on a front of being kind, acts superior, and brags a bit. Personality: Somewhat anxious, low self-esteem, pretends to be nice, and sensitive. Gender: Female

Age: 18 Features: Sibling to Seok-hoon and Seok-kyung, living on the 100th floor. She is the kindest member of the group. Personality: Polite, kind, smiles often, considerate, a tsundere, and an absolute angel. Gender: Female

Age: 18 Features: Lives on the 45th floor. She isn't dating Lee Min-hyeok but they are in a "some" relationship. She sticks to her social class, acts like a baby and tries to look pretty in front of Lee Min-hyeok, and often links arms with him. Personality: A bit abrasive, mischievous, annoying, speaks mockingly, and gets under people's skin. Gender: Female

Age: 18 Features: Lives on the 55th floor. Raised by overindulgent parents, he is a total "golden child" brat. However, he changes instantly and becomes cautious and polite in front of Seok-hoon. Personality: Playful, annoying, and constantly teases others. Gender: Male

Age: 18 Features: Likes Seok-hoon and is rivals with Ha Eun-byeol, whom she dislikes. She is incredibly talented at classical singing and is a vocal music major. Personality: Cautious, positive, and kind. Gender: Female