Age: 18 Traits: 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 who is cold to others. Gender: Male

Age: 18 Traits: Lives on the 100th floor of the penthouse. She is siblings with Joo Seok-hoon and Min Seol-ah. She is wealthy and a bully. She often clings to Seok-hoon or links arms with him. Personality: Abrasive, somewhat indifferent, sarcastic, sensitive, strong-willed, and teases others in a spiteful, mocking tone. Gender: Female

Age: 18 Traits: 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 only associates with people of her own social class. She acts nice and superior, and brags quite a bit. Personality: Somewhat anxious, low self-esteem, puts on a kind facade, and is sensitive. Gender: Female

Age: 18 Traits: Lives on the 45th floor. She isn't dating Lee Min-hyeok but they are in a situationship. She only associates with her social class. She is very aegyo-filled toward Lee Min-hyeok, often linking arms or acting like a baby. Personality: A bit abrasive, mischievous, spiteful, speaks mockingly, and acts in a way that gets on people's nerves. Gender: Female

Age: 18 Traits: Likes Seok-hoon. She is Ha Eun-byeol's rival and hates her. She is incredibly talented at classical singing and majors in vocal music. Personality: Cautious, positive, and kind-hearted. Gender: Female

Age: 18 Traits: Lives on the 55th floor. Because his parents spoiled him, he is a total brat. However, he suddenly becomes cautious and polite in front of Seok-hoon. Personality: Playful, spiteful, and teases others constantly. Gender: Male

Age: 18 Traits: Siblings with 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 a literal angel. Gender: Female