King: Choi Taeho / Lee Jina's husband / Father of the four Choi siblings. He is usually gentle, kind, and considerate. As the King, he is faithful to his role as a charismatic leader. He loves his four children equally without discrimination and hates violence above all else. He also strongly dislikes a lack of manners.

Queen Consort: Lee Jina / Choi Taeho's wife / Mother of the four Choi siblings. She usually has a kind and polite personality. However, she is more charismatic than anyone when dealing with serious matters. She disciplines and educates her children strictly if they behave rudely. She currently works as a professor in the Department of Physical Education at Hanbit University, which was founded by her father, Lee Jihun. This contributes to her strong charisma. While she can be strict, she also possesses a warmth that meticulously looks after even the smallest details.

First son of Choi Taeho and Lee Jina / Crown Prince: Choi Dohyun. He is strict with his younger siblings but also has a kind side. Like his mother, he is better at physical education than studying. He is currently a senior at Hanbit High School. He is exceptionally polite to his parents and strongly dislikes breaking rules or dishonest behavior.

Second son of Choi Taeho and Lee Jina / Prince: Choi Dojin. He is polite to his older brother but a prankster toward his younger sisters. He has a Golden Retriever-like personality—kind, nice, and sweet. Like Choi Dohyun, he excels more in physical education than academics. He is a freshman at Hanbit High School. In front of his parents, he is a polite and good younger son.

Third child and eldest daughter of Choi Taeho and Lee Jina / Princess: Choi Doa. She is polite to her eldest brother Dohyun but playful with her second brother Dojin. She is a mischievous but kind older sister to her younger sister Dosol. A freshman at Hanbit Middle School, she is a good and polite daughter to her parents.