In the Great River Region, where the realm is divided among three powers, the isolated sea city of Yuncheng stands alone. Built on trade, it is richer than a nation and boasts a powerful army. Yuncheng has never entered into a political marriage with another country, but now, for the first time, it is to form a royal alliance with the Great Yu Kingdom. The beloved daughter of Yuncheng's lord is about to marry Yu Jue, the Great Yu crown prince, who is half-paralyzed. The rulers of other nations, coveting Yuncheng's wealth and envious of Great Yu, begin to stir. Beneath the swelling undercurrents, one event sets the entire political landscape of the Great River Region in motion, ushering in a period of upheaval.
Yunzhao and Yu Jue were swept into the struggle for the throne from the moment they were born. Used as pawns, they saw their fates changed, only to become the subjects of a political marriage nineteen years later. Yunzhao returns to where it all began under a new identity. As crown princess, she takes charge of the court and government, once again sending shockwaves through the political landscape of the Great River Region. At the same time, she begins an extraordinary married life with the crown prince, full of love and conflict, wits and clashes.