Female, 17 years old. The Chunyeo of the Southern Ju family among Crown Prince Yo-myeong's five candidates. Despite being from a branch family and originally ineligible, she became a Chunyeo through the influence of Noble Consort Ju A-mi. She is notorious for her foul personality and is despised as the 'Rat of the Autumn Palace.' Appearance: Tall with a glamorous figure and red eyes. Personality: Passionate and childlike. She has low self-esteem, easily falls into inferiority complexes, and has volatile emotions, yet she remains human. This stems from a lack of mental maturity due to an unhappy upbringing. Specialty: Possesses incredible talent in Taoist arts. She can manipulate fire, use Pyromancy (allowing real-time communication by showing the other person within flames, similar to a modern video call), and perform body swapping. Past: Born to a Taoist master whose sect was suppressed during the previous Emperor's reign and a woman from a fallen branch of the Ju family, she suffered abuse and neglect. Her parents committed suicide due to debt, and Hye-wol, inheriting the massive debt, became a maid for the Ju main house. One day, Noble Consort Ju A-mi visited and witnessed Hye-wol's fire-controlling arts. Surprised that such arts still existed and pitying her, A-mi made her a Chunyeo. Unable to adapt to palace life and bullied by the main house maids for being a 'country girl' from a fallen branch, Hye-wol was left isolated. A-mi merely watched, saying she wished Hye-wol could swap bodies with Hwang Yeong-rim. Neglected and uneducated in the palace, Hye-wol's stress exploded, leading her to commit indiscriminate violence against maids and eunuchs. The Crown Prince and other families, unaware of the circumstances, naturally viewed her as a villainess. Jealous of Yeong-rim, who was loved by everyone, she swapped bodies to become her. However, contrary to her expectations, she is now suffering because Yeong-rim's body is extremely frail.

Male, 20 years old. The Crown Prince of the Empire of Yeong. He is Yeong-rim's cousin and truly cherishes her. He was born with the 'Dragon's Aura.' He feels a sense of dissonance in Ju Hye-wol's changed attitude but fails to realize the truth, reacting cynically as he assumes she is merely imitating Yeong-rim.

Female, 17 years old. A palace maid dedicated to the Chunyeo of the Ju family. Her mother was a Westerner, so she has red hair. She is the daughter of a foreign dancer skilled in the Hosen dance and a high official of the Ju family who took her mother as a concubine. Due to her mother's origins, she was not given the Ju surname. The primary wife persecuted Ri-ri and her mother. Ri-ri tried to become a court historian by studying literature, but because of her mother's background, she was subjected to constant insults and abuse by Hye-wol and other maids, called the 'lowly daughter of a foreign dancer.' She inherited her mother's talent for dancing. As the maid serving Ju Hye-wol, she hates her deeply due to the abuse. However, after Ju Hye-wol and Hwang Yeong-rim swap bodies, she begins to slowly open her heart as Hye-wol's attitude becomes the complete opposite of before.

Hwang Yeong-rim's chief palace maid, possessing immense loyalty toward her. Originally a maid serving Hwang Gyeon-su in the Empress's Palace, she was reluctant when Gyeon-su sent her to Yeong-rim. However, seeing Yeong-rim always doing her best despite her frail body, she was moved and came to serve her with genuine devotion.

Male, a Chigwan (official). He has a blunt personality. Since Yeong-rim's soul entered Hye-wol's body, he finds her changed attitude suspicious yet intriguing.