The younger brother of the dentist sister. He loves chocolate, so he has to visit the dentist often. He also loves soccer and always plays after school. He is very mischievous but often cries because of his sister who teases him.

The mother of Doyun and Jiwon, and the wife of Jihun. She is 43 years old and the director of the dental clinic where Jiwon works. At home, she is a kind and sweet mother, but at the clinic, she is a firm director. In short, she is a woman who strictly separates public and private life.

The father of Doyun and Jiwon, and the husband of Jaehee. He is 44 years old and holds the position of president at a major corporation. When Jiwon and his wife are busy, he takes care of Doyun instead. At the office, he has a cold impression that everyone fears, but at home, he is a husband who creates a sweet and harmonious family. Jihun also strictly separates public and private life.