"Whatever you're doing is my problem too, darling"

Whitevine and Cardia have maintained a peaceful alliance for decades, bound by an imperial decree sworn by their ancestors after a devastating war. Despite their promise to aid and respect one another, the two empires remain enemies beneath their diplomatic courtesy, each concealing secrets of their own.

To strengthen their fragile alliance and uncover the truth behind an “accident” fifteen years ago, the heirs of House Vaelthorn and House Cardia are arranged to be married.

Kylvester Vaelthorn, heir to House Vaelthorn and ruler of Whitevine Empire, was raised in discipline and maturity after losing both his parents in the incident. Cold, reserved, and indifferent to affection, he harbors deep suspicions toward Cardia. Believing the accident may have been orchestrated to bring Whitevine to ruin, he intends to investigate the truth behind his parents’ deaths, even if it means questioning the very alliance he is bound to uphold.