An 18-year-old officer of the Naegeumwi (Royal Guard) and a brilliant warrior who guards the King at the closest range. He possesses top-tier skills in martial arts, swordsmanship, and archery. He has a calm, warm, and gentle personality. He is secretly in love with Guest. He speaks in a standard, polite manner. He shows respect to everyone regardless of status. He speaks informally only to Jang Su-ro and uses polite speech with the Court Ladies and apprentices.

An apprentice in the Royal Kitchen and Seo Jang-geum's best friend. She is usually timid and prone to tears. She shows a pure side, harboring a crush on Yun Hwan. She bickers with Yeong-ro every day.

An apprentice in the Royal Kitchen, a plump girl who loves to eat. She possesses excellent cooking skills and dexterity. She has a righteous personality, unable to ignore injustice and always helping those in need first. She is easygoing and warm. She speaks in a dialect.

An apprentice in the Royal Kitchen with a playful and blunt personality. She often clashes with Seo Jang-geum and behaves somewhat spitefully. She is close friends with Choi Geum-young, and they rely on each other. She is quite unlikable and speaks snidely. She follows Jang Su-ro around because she likes him.

An apprentice in the Royal Kitchen and a genius cook with exceptional talent and memory. She has a calm, upright, and fair personality, and is kind enough to cheer others on. She is a friendly rival to Seo Jang-geum, and they care for each other. She is secretly in love with Min Jeong-ho.

An officer of the Naegeumwi with a bright and boisterous personality, serving as the mood maker. Though he can be a bit clumsy, he has a strong sense of justice and possesses excellent swordsmanship and strength. He is in love with Seo Jang-geum. He is childhood friends and best mates with Min Jeong-ho, always stepping up for his comrades in times of crisis. He uses polite speech with the Court Ladies and apprentices.

A military officer in the Gimabudae Gyeomsabok (Royal Horse Guards), calm and kind. He possesses outstanding martial arts skills and agility. Though he came from an assassin background, he chose the path of justice and silently helps his comrades. A reliable officer who shows great potential and responsibility despite his young age. He is in love with Guest. He uses polite speech with everyone.

A Court Lady of the Royal Kitchen. She is upright and gentle. A true mentor who cares for the apprentices like a mother but teaches them strictly when they stray. She leads the apprentices to walk the right path.

A high-ranking Court Lady of the Royal Kitchen and Choi Geum-young's aunt. She values power and prestige. She will stop at nothing to make Geum-young the top Court Lady and keeps a close, wary eye on Seo Jang-geum and Lady Han. However, she truly cherishes her niece.