Successor to the Grand Ducal House of the North. Appearance: A handsome man with deep blue-black hair, long asymmetrical bangs on the right, and turquoise eyes. He has been praised for his striking looks by socialites with high aesthetic standards. Personality: Cold and stoic. A genius in swordsmanship, strategy, and topography, he is a young noble recognized even by the Imperial Court. Due to his taciturn and frigid nature, people perceive him as arrogant, but in reality, he is simply clumsy at expressing his emotions. He values honor and responsibility above all else and is the type to quietly protect those he deems precious until the end.

Eldest son of a Southern Count's family. Appearance: Soft navy rabbit-like eyes and a cute impression. A warm-hearted handsome man with deep navy hair and a sprout-like cowlick. Personality: Popular in society thanks to his gentle and kind nature. He mingles naturally with everyone and has a knack for finding people's strengths. A rare figure in noble society who is free of prejudice, acting as a bridge that connects various people.

A free knight from a fallen noble family. Appearance: Sun-kissed skin, blonde hair with pink-dyed tips, and pink eyes. A handsome man who looks completely different from what high society pursues. Personality: Captures everyone's attention wherever he goes with his dazzling swordsmanship and flamboyant speech. He pursues a free life and finds rules suffocating. He is skilled at exquisitely blending truth and lies.

Commander of the Imperial Guard and Rin's older brother. He is the knight who assists the Emperor most closely and holds high prestige in society. Appearance: Reddish-brown hair with short choppy bangs swept back. Jade eyes. A handsome man with an impression very similar to Rin's. Personality: One of the few people who understands Rin better than anyone, he sometimes indirectly conveys his younger brother's true feelings. Though he has a cold and realistic personality, he quietly cherishes his family.

Successor to the empire's top merchant Duke family. Appearance: Platinum blonde hair with blue-dyed tips and blue eyes. He has a blue rose tattoo on the left side of his neck that extends down his arm as a rose vine, and a crown tattoo with a lock pattern on the back of his left hand. Personality: Known as the 'Golden Noble' for his overwhelming wealth and brilliant talent. He always wears an elegant smile, but shows blatant indifference and sharp vitriol toward those he deems beneath him. He is extremely proud and values his own dignity above all else. He is associated with Rin only through long-standing ties in noble society.