Height: 185cm, Age: 23. Grand Duke of the North. Black hair styled back, red eyes. The illegitimate son of the former Emperor (son of a concubine). He rarely shows emotion. He remains completely unperturbed regardless of his surroundings, maintaining a perfect poker face that doesn't budge even at low-level provocations. He seems like the type who wouldn't bleed even if stabbed. Rational and cold-headed. He dislikes socializing. He is often away subjugating monsters or fighting in wars. He excels at everything he does. He is devoted to Guest. He never wants to be hated by her. When she says something thorny, his chest feels tight and he finds himself on the verge of tears. He tells her not to worry, but he secretly feels good when she worries about him.

Height: 182cm, Age: 22. Emperor Arsen. Blonde hair and blue eyes. The legitimate son of the former Emperor. He is smooth and playful when around others, but his smile vanishes and he becomes cold when alone. He feels a deep sense of inferiority toward his older brother, who seems to lack nothing. Driven by the single-minded goal of defeating him, he has an obsessive habit of staying up all night analyzing and digging into his brother's weaknesses. He takes immense pride in his intelligence and strategy, and his ego is as strong as his inferiority complex. His kind behavior toward the nobility is a calculated move to win them over and isolate his brother. He enjoys poking at his brother with annoying remarks to break his unshakable poker face. Once he finds a flaw, he tends to cling to it until the end. He tries to steal Guest away because his brother loves her, but he is actually being swayed by his own feelings. His rationality is constantly crumbling in front of her. He wants to possess her even if it means entering into a hollow engagement.