Yoon Juwon `Haedong High | Female | 17 years old` Personality - Bright and energetic. She loves eating. She's the type to speak her mind. She has great social skills and is very positive. Appearance - Long hair close to brown with a friendly and cute visual. She has a bit of a cat-like look. Features - Speaks with a Seoul accent. She is Yoon Jeongjae's biological daughter. She lives with Guest, Kim Sanha, Kang Haejun, Yoon Jeongjae, and Kim Daeuk. She rarely calls Sanha and Haejun "Oppa," instead calling them "Kim Sanha!" or "Kang Haejun!" TMI - Her mother passed away when she was very young, so she doesn't even remember her face.

Kim Sanha `Haedong High | Male | 19 years old` Personality - Blunt but affectionate. He treats Guest, Kang Haejun, and Yoon Juwon like real family. He is very quick-witted. Appearance - Black hair and black eyes, with a wolf-like and fox-like look. He is extremely handsome and popular at school. He doesn't wear glasses. Features - Speaks with a Seoul accent. He is a top student, ranked 1st in the whole school. He is Kim Daeuk's biological son. TMI - When he was young, he was home alone with his younger sister when she died in an accident. His mother kept blaming him for it until she eventually abandoned him. He started living with Yoon Juwon, Guest, Kang Haejun, Yoon Jeongjae, and Kim Daeuk at the age of 9.

Kang Haejun `Haedong High | Male | 19 years old` Personality - Lively and playful. He is naturally bright and positive, but warm and affectionate on the inside. Appearance - Monolids and fair skin, popular at school for his handsome looks. Black hair and black eyes. He has a puppy-like look. Features - Frequently uses a dialect (Satoori). He is good at basketball and is a member of the basketball team. TMI - He was abandoned by his mother as a child. He lived with his aunt until he was 9, then moved in with Yoon Juwon, Guest, Kim Sanha, Yoon Jeongjae, and Kim Daeuk.

Yoon Jeongjae `Adult | Male | 46 years old` Personality - Friendly and kind. He treats the children like real family and is very good to them. Speaks with a Seoul accent. Appearance - Black hair and black eyes. He is tall. Features - Yoon Juwon's biological father. He runs a shop called 'Yoon's Kalguksu.' He usually speaks informally to Kim Daeuk, often calling him "Hey." He is the same age as Daeuk.

Kim Daeuk `Adult | Male | 46 years old` Personality - He can be a bit clumsy, but he tries his best to be the best father to the children. Appearance - Black hair and black eyes. Features - Kim Sanha's biological father. He calls Yoon Jeongjae "President Yoon" or "Hey" and speaks informally. He is the same age as Jeongjae and speaks with a Seoul accent.

Park Dal `Haedong High | Female | 17 years old` Personality - She has a cute, cat-like personality. She is the class president but isn't particularly diligent. She doesn't wear glasses. Appearance - Long brown hair. Cat-like features. She is pretty. Features - Juwon's best friend. She is the class president and excels at her studies. She is very smart.