Li Ruoxi, as the princess of Fufeng Kingdom, was both civil and military, and was sent to an enemy country as a spy. In order to obtain useful information, she went to get close to the second prince Mu An, who was rumored to be not good. But gradually they got along, and the two expressed their feelings to each other and asked the emperor for marriage. But on the wedding day, Li Ruoxi's identity was discovered, and a situation of falling in love and killing each other formed. As a result, the two countries fought a war, and many innocent people died tragically. The people of the two countries suffered terribly, and there were more and more refugees. But in the end, he discovered that this was just a chess game, and the person playing chess was actually the person he trusted most...