The protagonist of this work. He is on the shorter side and has a past of being abused during his childhood. A heavy drinker who loves alcohol, he has a unique habit of putting liquor in a teapot and drinking it like tea. His primary spiritual power, fire, is overwhelmingly strong even among the princes; if he fails to control the excessive heat properly, it can trigger seizures. While he appears indifferent and composed on the outside, he harbors deep scars from his past.

Possesses an appearance that exudes an ominous and eerie atmosphere and uses a sword similar in form to the swords of the celestial gods. He was abused in his childhood for resembling a ghost but was taken in by Jeokyeon and became his subordinate. Due to his past, he shows a loyalty to Jeokyeon that borders on blind devotion. He sometimes delivers false information to Jeokyeon after hearing strange rumors in the Imperial Palace. He dislikes Baekrang considerably.

A glutton who can eat more than five meals a day, he enjoys traveling to various regions to taste food from famous inns. Although not a prince, he can manipulate spiritual power, and his skills are so great that even Biseol cannot accurately measure his martial prowess. He harbors many doubts about Biseol's identity and hides significant skill behind a light and sly demeanor. He is a subordinate of Ryu Doha.

The only legitimate prince born between the current Emperor Ryu Hwa and Empress Hwarim. He is noble, strict, and thoroughly observes etiquette and palace laws. Since entering the palace, he has never once broken a palace rule and is so strict with himself that he often skips meals. Jeokyeon evaluates him as a lofty and difficult person. His palace is very quiet and desolate. His subordinate is Baekrang.

The only one among the princes who wears glasses. He takes special care of the 20th Prince, Ayeon, and is a figure trusted by him. Originally, he was the first to enter the palace and held the position of the 1st Prince, but he was pushed down to 2nd Prince when Doha, the Emperor's biological son, was born. He experienced the tragedies of the court and the conspiracies of supporting factions to prevent the Empress's conception. Although he smiles gently on the outside, he is evaluated as a meticulous and cold person who can make the most cruel moves against Jeokyeon.

Possesses a sly and relaxed personality. He is socially adept enough to get along freely even with Choran, who has a fiery temperament. His Nahan Pavilion is famous for accumulating the most wealth among the princes. It grew based on a city where trade flourished along the coast, and he is knowledgeable about the cultures, legends, and new artifacts of various regions. He is sharp with calculations and profits and has broad insight into many fields.

Possesses a beauty so great that he ranks first in portrait sales. He showed unusual interest in the 4th Prince Jeokyeon from their first meeting and has since actively expressed his affection. He tends to clearly reveal his feelings for Jeokyeon and has a special attachment to him.

A prince with a fiery and straightforward personality. He has strong pride and loves flashy accessories. He has a unique taste of never wearing an accessory again once he has worn it. Characterized by a brilliant appearance and intense personality, he was the first to appear at the Samra Labyrinth competition. He stays close to Haeeon and naturally accepts his relaxed personality.

Cherishes animals deeply and is the only one among the princes to raise various animals in his palace. He trusts and relies on the 2nd Prince Jeongwon more than anyone else. He possesses a pure and kind side and passed the trial in the Corridor of Endurance competition based on a faith stronger than fear.

A figure with the most powerful strength among all successive emperors. He has held the throne for a long time, enjoying a long life, and enjoys reminiscing about past memories. He also has an unexpectedly humorous side, such as frequently playing pranks on his subordinate Heukyeong. He is the biological father of the 1st Prince Ryu Doha and the absolute ruler of the Yeolguk Empire.