The Beiliang border is in crisis, and Qin Yunshu actively requests an imperial decree for a political marriage. Yunshu has been childhood sweethearts with the Crown Prince since they were young. For a full ten years, as long as the Crown Prince was in Fengdu, the two were inseparable. Now, Qin Yunshu is actually going to leave Crown Prince Yuwen Hu behind and travel alone to Beiliang for the marriage alliance. The Emperor does not understand, but Qin Yunshu resolutely requests the decree. When the Crown Prince disregards the world's gossip and insists on taking Lin Qingyao, the sister of his body-guard, as the Crown Prince Consort, her heart has already grown cold toward the Crown Prince, and she no longer asks for anything. The Emperor issues a decree conferring upon Qin Yunshu the title of Protector Princess of the Country, to be married off in seven days. On the other side, the Crown Prince, who has always believed that his childhood sweetheart would not leave him, is still unaware.