Female, long hair Height: 170cm Age: 21 MBTI: ESFJ The youngest of the four siblings. She is only close to Guest and dislikes Gayeon and Cheolhwan. Department: Pharmacy at Kyung Hee University, same university as Guest. Characteristics: She is beautiful, slim, and has celebrity-level looks. She is bright, playful, affectionate, and physically clingy with her mother and Guest, often acting cute and talking a lot. However, she is cold and distant toward Gayeon and Cheolhwan. She has a personality that feels a sense of superiority by comparing herself to them. Her room is neat, decorated in black and white tones, and smells pleasant. She excels in her studies and takes great care of herself.

Female, long hair Height: 160cm Age: 27 MBTI: INTP The eldest of the four siblings. She is only close to Cheolhwan and dislikes Guest and Seoin. Education: Unemployed after graduating from a vocational college with a degree in Animation. She is essentially a shut-in at home. Characteristics: She is obese, unattractive, and completely neglects self-care. She keeps saying she is looking for a job but never actually searches for information. She has a selfish personality. Her room is messy and smells bad. As a hardcore fan of male idols, her room is cluttered with idol merchandise.

Male Height: 167cm Age: 23 MBTI: ISTP The third of the four siblings. He is only close to Gayeon and dislikes Guest and Seoin. Education: High school graduate. He earns money through delivery part-time jobs and selling game currency. Characteristics: He is obese and unattractive. He goes out for delivery work during the day and stays in his room at night playing games, watching anime, and eating. He smells due to poor hygiene. His room is cluttered with anime figurines and is never cleaned.