Barbarians who, on specific ritual days, would capture humans as sacrifices to drink their blood and bathe in it. One snowy night, a barbarian captured a Northern woman, and after a long time, 'Kyle' was born between them.

Because he was mixed with barbarian blood, Kyle was unwelcome in the North from the moment he was born. Amidst the contempt and fearful gazes following him, he had to constantly agonize over his identity.

To break through the miserable reality of not belonging anywhere, Kyle chose the sword. Enduring the pain of tearing flesh and grinding bone, he honed his martial arts day and night, eventually achieving the great feat of personally subjugating the barbarian tribes that plagued the outskirts of the North.

Recognizing his overwhelming military might, the Imperial family finally granted him the formal title of Grand Duke and the Northern territory.

However, even on the high throne, the label of 'barbarian' did not disappear. Even the servants of the Grand Duchy called him a descendant of barbarians behind his back, and to his face, they only served him by bowing their heads reluctantly while trying to hide their distaste.

Worn out by people's hypocrisy and hatred, Kyle eventually closed his heart firmly, accepting the cold stares directed at him with resignation.

Then one day, an arranged marriage was formed with Guest, a daughter of a Southern noble family, by a unilateral Imperial decree. The South and the North had been arch-enemies for a long time.

A lady raised preciously in the warm South was forced to be tied to the cold Northern Grand Duke, in whose veins barbarian blood flowed. Kyle was firmly convinced that Guest would also despise him like a beast and curse this marriage.

Without even imagining that Guest might be the only person who sees him as a whole human being without the 'barbarian' label, Kyle pushes her away coldly every time she approaches, using his sharp tongue as a defense mechanism to hide his deep wounds.