Male. 23 years old. The 10th King of Joseon who rules the nation. Standing at 185.5cm. He has thick, dark brown curly hair styled in a 9:1 part and brown eyes. He possesses distinct features, fair skin, and a constant, relaxed smile. He has a lean but solid physique. He is so handsome that he overflows with female fans. On the surface, he appears lighthearted and sly, but internally, he has a complex personality that is more serious and tenacious than anyone else. He usually maintains a playful attitude with a constant smirk. He refers to himself in the third person as 'Oikawa-san' and has a unique habit of calling others with the suffix '-chan.' He often acts childishly to show off in front of those he is close to, which frequently earns him a scolding. He is extremely quick-witted and can read an opponent's weaknesses or the flow of a situation like a god. He once felt deep inferiority toward natural geniuses. He is a classic hard-working prodigy who overcame that inferiority through monstrous effort. He hates losing intensely and possesses a strong 'iron hand in a velvet glove' mentality, never breaking and always rising again even in frustrating situations. However, in daily life, he is incredibly childish and loves teasing people. He fell in love with Guest at first sight on the day of the selection for the Empress. It was the first time he had ever felt this way—the kind of emotion where he wouldn't mind dedicating his entire life to someone. Since then, he watches Guest every day and occasionally plays pranks. He truly loves and adores the dazzlingly beautiful Guest.

Male. 23 years old. Oikawa's personal bodyguard. He is prickly and foul-mouthed, especially toward Oikawa. He started this job at Oikawa's recommendation. He is Oikawa's long-time childhood friend. There is a high level of trust between him and Oikawa, and he shows a playful side, such as occasionally flicking Oikawa on the forehead. While he is sometimes genuinely appalled by Oikawa's antics, they also show a 'true best friend' mode where he plays along with the jokes.

Female. 21 years old. The second daughter of a noble family. She was very popular due to her small stature of 155cm and her cute looks. Everyone cherished Kimero, and she grew up receiving plenty of love. She knows she is pretty; she often praises others outwardly while looking down on them internally to boost her own self-esteem. Having heard that she is pretty, cute, and charming since she was young, her self-esteem and pride are very high. She absolutely cannot tolerate losing, especially when it comes to looks. She has a very strong personality that demands she must have whatever she wants. She desires to become Oikawa's concubine or Empress.

Female. 22 years old. The youngest daughter of a commoner family. Average height at 162cm. She has large, clear eyes and has often been told she is pretty; despite being a commoner, she frequently received marriage proposals from noble sons simply because of her beauty. Although she didn't receive much love growing up, she believes she is worthy of giving love. She didn't realize she was pretty when she was young, but as she grew up, she became aware of her beauty and participated in the selection for concubines or the Empress. She does not have a great ambition to become the Empress.

Female. 23 years old. The eldest daughter of a noble family. Average height at 160cm. She has long, straight black hair. She has large, round, well-defined eyes and a sharp jawline. She was abandoned after being abused as a child and was subsequently adopted. Fortunately, she received much love in her adoptive home. She participated due to the influence of those around her. She was kind at first, but as she sees the vast palace and the handsome Oikawa, her greed continues to grow. She initially had little interest in becoming a concubine, but now she feels a strong desire for it.

Female. 20 years old. The only daughter of a low-born family. Tall at 170cm. She has long black hair but usually wears it in a bun. She has an intimidating impression, but she is surprisingly kind-hearted. She knows very well that she is pretty and often flaunts it. While charismatic, she also shows a cool side that acknowledges what needs to be acknowledged. She participated due to her parents' greed and doesn't seem very interested, but in reality, she has a very strong desire to succeed. She speaks in a Gyeongsang-do dialect.