Name: Seong Heeju (IU, Consort, Grand Consort) Age: 32 Stats: 162cm, 44kg Personality: Extremely bold, speaks her mind, and is strong against the strong and strong against the weak. Status: Commoner (Grand Consort after marriage) Features: CEO of Castle Group (K-Beauty) and known as the 'Mad Dog' of Castle Group. The second child of Castle Group, which shines at the top of the business world. Not only was she born with a silver spoon, but she also possesses stunning looks and a brilliant brain. Added to that is a fierce competitive streak, giving her a 100% win rate. "I'd rather win dirty than lose cleanly." Since she doesn't stop until she wins, her battles never end. It's only natural that someone like Heeju can't stand the sight of high-and-mighty nobles.

Name: Yi An (Byeon Wooseok) Age: 34 Stats: 190cm, 73kg Personality: Quiet, occasionally smiles, and is gentle, but becomes terrifying when angry. Status: Royalty Features: The pride and the danger of the royal family. The second son of King Huijong and the only younger brother of King Seonjong. Being the second son in the royal family was both a permit to 'do nothing' and a shackle to 'do nothing.' A life where he could neither shine nor make a sound was no different from a painting displayed in a museum. The problem was that his fate was not as calm as a painting. With an overflowing competitive spirit, a fiery temper, and a preference for the color red, he was a burning boy. King Huijong was wary of such a son.

Name: Min Jungwoo (Noh Sanghyun) Age: 35 Stats: 181cm, 66kg Personality: Confident, realistic, and terrifying when angry. Status: Noble Features: Head of the executive branch. The firstborn of the Min family, which has been active in politics for generations. It is a fact known to every citizen that his father and his father's father served consecutive terms as Prime Minister. So, it is no surprise that Jungwoo is also walking the path of a Prime Minister. What is surprising is his brilliant brain and even more brilliant looks, surpassing his perfect background. He is even kind and talented at flirting. Thanks to this, he, not Grand Prince Yi An, holds the title of the #1 man people want to marry.

Name: Yi Yun (Kim Eunho) Age: 8 Stats: (Private) Personality: Soft-hearted, quirky, and kind. Cute even when angry. Status: King Features: The current King. The only son of King Seonjong and the nephew of Grand Prince Yi An. He is smart and kind-hearted but is always intimidated and tense. Some say it's because he ascended the throne at a young age, but Yun's frailty was severe even before his accession. His father was always drunk and angry, and his mother was always strict and cold, so it was inevitable. Every time, his escape was his uncle, Grand Prince Yi An, who hugged him often like a father and smiled warmly like a mother. However, his uncle's kindness came to an end with his father's death.

Name: Yun Irang (Gong Seungyeon) Age: 33 Stats: 165cm, 44kg Personality: Sensitive, confident, and cold. Terrifying when angry. Status: Royalty Features: The perfect Queen. Born into the Yun family, which has produced four Queens, she is the perfect Queen. In such a family, Irang learned how to walk without making a sound, how to smile even when angry, and how to live like a flower. Some disparaged it as a suffocating life, and others praised it as a glorious life, but Irang felt nothing. Even that was very Queen-like. Enrolling in the Royal School instead of Sungkyunkwan, she met Grand Prince Yi An, her future brother-in-law, before she met her betrothed, the Crown Prince.

Name: Do Hyejeong (Lee Yeon, Aide Do) Age: 31 Stats: 161cm, 45kg Personality: Confident, cheerful, and kind. Status: Commoner Features: A genius who grew up and studied abroad. Perhaps because of that, she is not familiar with the social atmosphere of Korea. She doesn't understand Heeju's inferiority complex. What does it matter if one is a commoner or an illegitimate child? "Isn't that just like a blood type? It's just something you're born with." Because of this, she clashes with Heeju in many ways. However, Hyejeong is also the person Heeju relies on the most. The sensible and straightforward Hyejeong is a fragment of the most ideal world Heeju has ever imagined.

Name: Choi Hyun (Yoo Subin, Aide Choi) Age: 33 Stats: 180cm, 76kg Personality: Confident, cheerful, funny, has a sense of humor, and is kind. Status: Commoner Features: Publicly the aide to Grand Prince Yi An, and privately his servant. He had no parents, no relatives, and actually no name, as he was abandoned as an infant. Hyun knows this well but has never resented his parents. In fact, he is often grateful. If they were going to abandon him, they at least did it in front of Grand Prince Yi An's private residence. Inside the palace, he uses extremely formal language. He doesn't dare to meet the Grand Prince's eyes and keeps his back slightly bowed. He is afraid that if he acts presumptuously, it might tarnish the Grand Prince's dignity.