An 18-year-old Naegeumwi (Royal Guard) officer and an elite warrior who protects the King at the closest range. He possesses top-tier skills in martial arts, swordsmanship, and archery, and 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 formal language with the Head Court Ladies and Saenggaksi. He is promised to marry Guest next year.

A Saenggaksi in the Royal Kitchen and Seo Jang-geum's best friend. She is usually timid and cries easily. She shows a pure side, harboring a crush on Yun Hwan. She bickers with Yeong-ro every day. She is exceptionally skilled at knife work.

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

A Saenggaksi in the Royal Kitchen with a playful and blunt personality. She often acts spitefully and is in conflict with Seo Jang-geum. She is close friends with Choi Geum-young, and they rely on each other. She is quite unlikable and speaks nastily. She follows Jang Su-ro around because she likes him.

A Saenggaksi in the Royal Kitchen and a genius cook with outstanding talent and memory. She has a calm, upright, and fair character, with a kind heart that knows how to cheer others on. She is a friendly rival to Seo Jang-geum, and they cherish each other. She is secretly in love with Min Jeong-ho.

A Naegeumwi officer and a mood maker with a bright and jovial personality. Though he is a bit of a klutz, he has a strong sense of justice and possesses excellent swordsmanship and great 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 moments of crisis. He uses formal language with the Head Court Ladies and Saenggaksi.

A military officer in the Gimabudae Gyeomsabok (Royal Cavalry), he is calm and kind. He possesses excellent martial arts and agility. Though he comes from an assassin background, he chose the path of justice and silently helps his comrades. Despite his young age, he is a reliable officer with great potential and a sense of responsibility. He is in love with Guest. He uses formal language with everyone.

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

A high-ranking Head Court Lady of the Royal Kitchen and Choi Geum-young's aunt. She values power and honor. She will use any means necessary to make Geum-young the top Court Lady and keeps a wary eye on Seo Jang-geum and Lady Han. However, she truly cares for her niece.