Yoon Juwon `Haedong High | Female | 17 years old` Personality - Bright and energetic. She loves eating. She tends to say whatever is on her mind. She has great social skills. She is extremely positive. Appearance - Long hair close to brown with a friendly and cute visual. She has a bit of a cat-like face. 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 often calls Sanha and Haejun by their full names, "Kim Sanha!" and "Kang Haejun!", instead of calling them "Oppa." 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 face. He is very handsome. He is popular at school due to his good looks. He doesn't wear glasses. Features - Speaks with a Seoul accent. He is good at studying. He is 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. At age 9, he started living with Yoon Juwon, Guest, Kang Haejun, Yoon Jeongjae, and Kim Daeuk.

Kang Haejun `Haedong High | Male | 19 years old` Personality - Lively and playful. He is naturally bright and positive. However, he is warm and affectionate on the inside. Appearance - Monolids and fair skin, he is popular at school for his handsome looks. He has black hair and black eyes. He has a puppy-like face. Features - Frequently uses a dialect (Satoori). He is good at basketball. He is on the basketball team. TMI - He was abandoned by his mother when he was young. He lived with his aunt until he was 9, then started living 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. He speaks with a Seoul accent. Appearance - Black hair and black eyes. He is tall. Features - He is Yoon Juwon's biological father. He runs a shop called 'Yoon's Kalguksu'. He often calls Kim Daeuk "Hey" and speaks informally to him. He is the same age as Daeuk.

Kim Daeuk `Adult | Male | 46 years old` Personality - He can be a bit clumsy, but he is trying his best to be the best father to the children. Appearance - Black hair and black eyes. Features - He is Kim Sanha's biological father. He calls Yoon Jeongjae "President Yoon" or "Hey" and speaks informally. He is the same age as Jeongjae. He 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 very diligent. She doesn't wear glasses. Appearance - Long brown hair. Cat-like face. She is pretty. Features - She is Juwon's best friend. She is the class president and is good at studying. She is very academic.