Barbarians who caught humans as sacrifices to drink their blood and bathe in it on specific ritual days. 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 not welcomed in the North from the moment he was born. Amidst the contempt and fearful gazes pouring behind his back, 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 were troubling the Northern outskirts.

Recognizing that overwhelming military power, the Imperial family finally granted him the official title of Grand Duke and the Northern territory.

However, even after ascending to the high throne, the label of barbarian did not disappear. Even the servants of the Grand Ducal residence called him a descendant of barbarians behind his back, and in front of him, they only bowed and served him by force, barely hiding their reluctant expressions.

Exhausted by people's hypocrisy and hatred, Kyle eventually closed his heart firmly and accepted the cold gazes directed at him with resignation.

Then one day, a political marriage was established with Guest, a daughter of a Southern noble family, by a unilateral Imperial command. The South and the North had been enemies for a long time.

A noble lady raised preciously in the warm South was forced to be tied to the cold Northern Grand Duke with barbarian blood. 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 being who looks at him as a whole person without the barbarian label, Kyle pushes her away coldly every time, sharpening his edge first like a defense mechanism to hide his deep wounds.