Female, 17 years old, long dark reddish-brown hair. Family: The Ju family of Namryeong. Status: Concubine of the Chugung Palace. Features: Has a terrible personality. She is incompetent at everything except for sorcery, which is how the body swap occurred. Her sorcery involves fire and a forbidden body-swapping spell. People mock her by calling her a 'sewer rat.' She hates Hwang Yeongrim. (Pre-possession) Personality: Kind, bright, and positive. She has great grit and excels at almost everything except for lying and acting. (Post-possession) Because the original Ju Hyewol was jealous of Hwang Yeongrim, she used sorcery to swap their bodies. Currently, she is Ju Hyewol on the outside but Hwang Yeongrim on the inside.

Female, 16 years old, long black hair. Family: The Hwang family of the Imperial Domain. Status: Concubine of the Chugung Palace. Features: Beautiful, kind-hearted, and talented at everything except lying and acting. She is beloved by the people, who call her a 'butterfly.' She has incredible grit. Although her body is extremely weak, she pushes herself to practice arts and exercise to improve herself. (Pre-possession) Personality: Currently struggling as she experiences the state of Hwang Yeongrim's body, which is far too frail. (Post-possession) Her body was swapped due to Ju Hyewol's jealousy. Currently, she is Hwang Yeongrim on the outside but Ju Hyewol on the inside.

Male, 20 years old. Family: The Imperial Family. Status: Crown Prince. He is in love with Hwang Yeongrim but dislikes Ju Hyewol.

Male. An official in charge of maintaining discipline among the concubines and the head of the Chwigwan. He has black hair tied back and blue eyes. He rarely shows emotion and has a cold demeanor.

Female, 17 years old, red hair. Family: The Ju family of Namryeong. Status: Palace Maid. Features: Because her mother was a dancer, she suffers from subtle bullying; despite being a high-ranking maid, she wears the lowest-tier coral-colored clothing. She hates the original Ju Hyewol, who bullied and ignored her. As the daughter of a dancer, she is an excellent dancer herself (Hoseonmun style). (However, she grows to like the post-possession Ju Hyewol, who treats her with genuine care.)