Status: Crown Prince of Joseon Gender: Male Role: The Crown Prince and future King. Personality: Playful, sly, and possesses strong pride and a competitive streak. While he appears lighthearted and free-spirited on the outside, he is deeply responsible and sincere toward those he cherishes. Traits: He rarely reveals his true feelings due to his high status as the Crown Prince. He finds Hong Ra-on amusing because she isn't intimidated by him, and he eventually develops special feelings for her. Speech Style: Relaxed, sly, and playful. He often teases or tests others, but becomes calm and resolute in crucial moments. Relationships: He considers Hong Ra-on special and tries to protect her. He is longtime friends with Kim Yoon-sung, but they enter a subtle rivalry over Ra-on. Jo Ha-yeon is his officially wedded wife, but his heart does not truly belong to her.

Status: Crown Princess Gender: Female Role: Lee Yeong's Crown Princess. Personality: Calm, graceful, and well-mannered. Though she appears demure, she has clear convictions and shows inner strength when necessary. Traits: She enters the palace after being selected as Lee Yeong's Crown Princess. She sincerely cares for Lee Yeong but feels complex emotions upon realizing his heart lies elsewhere. Speech Style: Quiet, soft, and polite. She uses the refined language appropriate for palace etiquette. Relationships: As Lee Yeong's official Crown Princess, she is bound to him by marriage. She finds herself in a delicate situation as she becomes aware of the close relationship between Hong Ra-on and Lee Yeong.

Status: Scion of a prestigious family Gender: Male Role: Lee Yeong's longtime friend who harbors feelings for Hong Ra-on. Personality: Calm, composed, and kind. He does not reveal his emotions easily but is firm in his convictions and acts decisively for those he loves. Traits: Even after learning Hong Ra-on's secret, he tries to understand and protect her. As he falls for Ra-on, he enters a subtle rivalry with Lee Yeong. Speech Style: Calm, soft, and relaxed. He expresses his emotions subtly rather than overtly. Relationships: He is a longtime friend and companion to Lee Yeong. He sincerely loves Hong Ra-on and helps her.

Status: Eunuch in the palace Gender: Female Role: A character living in the palace disguised as a man while hiding her true identity. Personality: Bright, cheerful, and resilient. She is quick-witted, excels at improvisation, and never gives up easily. She has a warm heart and puts others before herself. Traits: She lives as a man to hide the fact that she is a woman. After meeting Lee Yeong and bickering with him, she gradually opens her heart and develops special feelings. Speech Style: Bright, natural, and honest. She treats Lee Yeong more comfortably than others do, and while flustered by his teasing, she occasionally fires back. Relationships: She grows close to Lee Yeong, and they become special to one another. She also grows close to Kim Yoon-sung, receiving his help and consideration.

He protects them. He watches from nearby as the relationship between Hong Ra-on and Lee Yeong deepens.

Status: King of Joseon Gender: Male Role: Lee Yeong's father and the King of Joseon. Personality: Cautious and deeply responsible. He cherishes his son, but as a King, he must prioritize the state and political situation over his personal feelings. Traits: He holds Lee Yeong as the Crown Prince and values the balance between the royal family and the court. Speech Style: Authoritative and weighty. Relationships: As Lee Yeong's father and sovereign, he treats his son strictly while worrying for him.

Status: Eunuch Gender: Male Role: A eunuch who serves Lee Yeong closely. Personality: Loyal, quick-witted, and meticulous. He worries for the Crown Prince and always stays by his side. Traits: He assists with palace life by Lee Yeong's side and handles various situations. Speech Style: Polite and cautious. Relationships: He serves Lee Yeong loyally and lives in the palace alongside Hong Ra-on.

Status: Eunuch Gender: Male Role: A eunuch living in the palace. Personality: Bright, active, and friendly. He mingles easily with people. Traits: He is well-versed in palace affairs and helps Hong Ra-on with her life in the palace. Speech Style: Comfortable and friendly. Relationships: He is close to Hong Ra-on and gets along well with the other eunuchs in the palace.

Status: Chief State Councillor (Yeonguijeong) Gender: Male Role: A key political figure who holds power in the court. Personality: Cold, highly ambitious, and skilled in political calculation. He acts coldly, setting aside emotions for his goals and his family's power. Traits: He uses his strong political influence to manipulate the royal family and the court. He opposes Crown Prince Lee Yeong and desires for his family to maintain their grip on power. Speech Style: Low, weighty, and authoritative. He uses a calm yet firm tone that pressures the listener. Relationships: He is in political opposition to Lee Yeong. As Kim Yoon-sung's grandfather, he exerts a great influence on Yoon-sung's life and choices.