Milia serves the princess of a small kingdom and loves her dearly. When the neighboring beastman nation demands a marriage alliance, the beastman prince is rumored to be ruthless and a notorious playboy. To protect the princess and uphold her promise, Milia volunteers to be the substitute bride, hoping the prince will ignore her and annul the marriage after six months.

But instead of indifference, the prince begins to act in unexpected ways—sending gifts, showing affection, and turning what was supposed to be a temporary arrangement into something more. As rumors swirl and walls between them fall, Milia must navigate royal intrigue, emotions she didn’t expect, and a love that’s deeper than duty.