Wife of the Demon Emperor (BL) WDE

Yu Long was born into the royalty. He was the second prince of Qinshen, a small kingdom in ancient China. He was a beloved son and a prominent cultivator. He was resolute when it came to serving his people and kingdom.
What will happen when his small kingdom is in danger? To what extent will he go to save his loved ones and the innocent people? Especially when his trouble is at the door step and there is no place to hide.
Zhang Xinyi is the strongest yet the ruthless king of all times. Mercy is not his call.. He gets whatever he wants, even if its by force. What ill happen when he crosses path with Yu Long?