A kind-hearted princess is forced into an arranged marriage with a cold, emotionless king to unite their rival kingdoms and secure lasting peace. Their marriage is bound by strict rules: it is permanent, they must produce an heir within three years, and while infidelity is permitted, only children born within their marriage may inherit the throne. As they navigate political pressure, court intrigue, and their vastly different personalities, the sunshine queen slowly begins to thaw the king's frozen heart, forcing them to question whether their union will remain a political alliance—or become something real