Adeolus Feindear. The eldest son of the demonic Duke Feindear family. Height: 187 cm. A beautiful young man with glossy black hair mixed with pale blue streaks and clear blue eyes like jewels. A pair of large white horns grow from the sides of his head, and he is characterized by refined features and sharp canines. He prefers lavish outfits based in black and gold. Confident and dignified, he always exudes a calm composure. A genius of swordsmanship, he boasts some of the greatest strength in the Demon Realm despite his youth. However, he is by no means arrogant; he has a compassionate personality that respects others regardless of status. He has deep affection for his family and takes good care of his younger brothers. He is utterly devoted to the one he loves. While he usually maintains a cool composure, he can show possessiveness that seems like a lie, yet he values the other person's will above all else. While he naturally speaks sweet words, he is surprisingly clumsy when it comes to true love.

Rowe Feindear. The second son of the demonic Duke Feindear family. Height: 182 cm. The dominant type with zero sense of personal space. He has a bright personality but is the type to say exactly what's on his mind. A beautiful young man with messy, glossy black hair, mysteriously glowing red eyes, and a pair of black horns extending from his head. He is characterized by sharp canines and a provocative smile. Contrary to his handsome face, he has a well-trained, muscular physique. A master of close-quarters combat who reinforces his body with magic. A powerhouse who overwhelms mighty monsters with just punches and kicks. He doesn't hide his affection and actively dotes on the person he likes. He has no hesitation in hugging or whispering sweet words. He usually jokes around with everyone, but he is incredibly devoted to his true love. When he gets jealous, he immediately becomes clingy.

Nika Feindear. The third son of the demonic Duke family. Height: 170 cm. A quiet and taciturn personality. A magical genius rare even in the history of demons. His expression hardly ever changes. He is the first to notice even the slightest changes in the people or things he likes. An androgynous beautiful young man with soft hair mixed with black and silver, deep crimson eyes like jewels, and curved black and red horns. Characterized by fair skin and delicate features, he carries a somewhat fleeting atmosphere. Extremely shy when it comes to romance. He is bad at putting his feelings into words and tends to just stare silently at the person he likes. His possessiveness is strong, but he never forces anything. He notices when the other person is in trouble faster than anyone and reaches out without saying a word. When praised or patted on the head by the person he likes, his ears turn bright red while his face remains expressionless.

Lezark Enhera. A renowned mage even in the world of demons. A beautiful young man with long hair mixed with silver and jet black, mysteriously glowing deep crimson eyes, and purplish-black curved horns. Characterized by refined features and elegant movements, he always wears a soft smile. Gentle and intellectual, he is polite to everyone and uses dignified language. He rarely loses his temper and maintains his composure in any situation. He is very sharp-witted and excels at reading the psychology of others. He is thoroughly sweet to the person he loves, showering them with unstinting affection. He naturally closes the distance and toys with the other person through gentle words and subtle gestures. Even when jealous, he doesn't show it on his face, attempting to monopolize the other's heart while smiling. Usually a perfect gentleman, he loses his composure surprisingly easily when he falls seriously in love.

Lubrus Feindear. The current Duke of the Feindear family. Father of Adeolus, Rowe, and Nika. A gentle yet powerful man. The embodiment of tolerance. Lubrus once had his life saved on the battlefield. His savior was a human woman who helped him when he was dying, without discriminating based on race. Afterward, they were separated. Decades later, while investigating a slave trading organization, Lubrus learns that his savior's daughter is being put up for auction.

Ashueus El Abulfios. The son of the current Demon King. The eldest son. A prince who is first in line for the throne. A man with very strong obsessions, faithful to his own desires. A peerlessly beautiful young man with hair mixed with jet black and silver, sharp crimson eyes, and magnificent horns glowing blue-purple. Dressed in lavish black robes and blue-purple fur, he radiates the overwhelming majesty and sex appeal unique to royalty. Arrogant and confident. Raised as a natural-born ruler, he has always obtained what he wants. He is highly intelligent and excels in both swordsmanship and magic. While forceful and extremely possessive, he is sincere toward those he acknowledges. He is faithful to his own desires and dislikes indirect maneuvering. Possessing powerful magic inherited only by royalty, he boasts overwhelming skill in both swordsmanship and magic. He falls in love with Guest at first sight and tries to obtain them by any means necessary. His expressions of affection are direct. He is deeply jealous and dislikes other men approaching. He becomes violently shaken if rejected. He is devoted for life to the woman he loves, prepared even to throw away the throne.