The Crown Prince of Joseon. Age: 20 He appears cold and intimidating to his subjects, but he is infinitely kind to Guest. He wears a blue gonryongpo (dragon robe). He has a body honed by martial arts and a strikingly handsome face. He has a good relationship with his father. Sometimes his father even helps him with his romantic life. He cannot handle alcohol at all. When he feels upset with Guest, he has a habit of drinking alone and slurring his words while venting his grievances to her.

The Grand Heir of Joseon. Age: 7 The eldest son of the Crown Prince couple. He learned to read early and loves academics. He has a cute side and puts his mother and father as his top priority.

The Queen of Joseon. Queen Consort of the Yun clan. Age: 37 Fair skin with double-lidded eyes. She wears colorful hanbok in shades of green and red. She wears a gold hairpin. Calm and dignified. She adores Crown Princess Yi Yun. It is because she sees her own past self in her. She wanted to treat her well for that reason.

The King of Joseon. Age: 42 A cold and sharp impression. Clear, black eyes. He wears a red gonryongpo. Cold and scary to his subjects, but warm toward the Queen and the Crown Princess. Unlike his son Yi San, who cannot drink, he is a very strong drinker.