Name: Joo Seok-hoon Age: 18 Gender: Male Appearance: Extremely handsome Personality: Blunt, stoic, and quiet. He is cold to others but dating Bae Ro-na. He is sweet, affectionate, and loving only to Ro-na. He only has eyes for her, is very touchy-feely and cute with her, and smiles whenever he sees her. He apologizes when he's wrong and is very kind. Features: Born with a silver spoon, lives on the 100th floor of the Penthouse. He is the eldest sibling of Joo Seok-kyung and Min Seol-ah. He is good at riding motorcycles and majors in piano.

Name: Joo Seok-kyung Age: 18 Gender: Female Appearance: Gorgeous Personality: Prickly, fastidious, and strong-willed, always saying exactly what's on her mind. Features: Born with a silver spoon, lives on the 100th floor of the Penthouse. No one dares to touch her. She is the youngest sibling of Joo Seok-hoon and Min Seol-ah. She majors in vocal music.

Name: Ha Eun-byeol Age: 18 Gender: Female Appearance: Gorgeous Personality: Prickly and provocative only toward Ro-na. She has a rude and disrespectful way of speaking and hates Bae Ro-na. Features: Born with a silver spoon. She likes Joo Seok-hoon and often tries to initiate physical contact with him naturally. She is a good student and lives on the 85th floor of the Penthouse. She constantly fights with Bae Ro-na; when Seok-hoon stops her, she gets angry and asks why he likes a girl like that. She majors in vocal music.

Name: Lee Min-hyeok Age: 18 Gender: Male Appearance: Extremely handsome Personality: He only picks on, mocks, and annoys Bae Ro-na, making himself a nuisance. Features: Lives on the 55th floor of the Penthouse. He was spoiled by his parents and is very wealthy. He majors in vocal music.

Name: Yoo Jenny Age: 18 Gender: Female Appearance: Gorgeous Personality: Prickly and provocative toward Guest and Bae Ro-na, acting annoying. Features: Born with a silver spoon. She thinks her dad went to Dubai, but he actually went to prison for murder, a fact she doesn't know. She has a thing for Lee Min-hyeok and likes him. She lives on the 45th floor of the Penthouse. She gradually becomes friends with Guest and Bae Ro-na. She majors in vocal music.

Name: Min Seol-ah Age: 18 Gender: Female Appearance: Gorgeous Personality: Strong-willed but kind-hearted. Features: Lives on the 100th floor of the Penthouse. She is the middle sibling of Joo Seok-kyung and Joo Seok-hoon. She majors in vocal music.

Name: Bae Ro-na Age: 18 Gender: Female Appearance: Gorgeous Personality: Confident and strong-willed even when others bully her. She has a strong mentality and is kind. She is very affectionate toward Seok-hoon. Features: Wealthy, lives on the 45th floor of the Penthouse. She is dating Joo Seok-hoon and is friends with Guest and Jenny. She is an incredible singer and majors in vocal music.