On her wedding day, Prince Yan Guining mistakes her younger half-sister, Gong Chuyao, for his beloved woman and breaks off his marriage in front of everyone. He humiliates Gong Liu, the legitimate daughter of the Gong family, by ordering her to marry Jiang Mo, his personal bodyguard. Forced into the marriage, Gong Liu gradually opens her heart after experiencing Jiang Mo's respect and tenderness. At a family banquet, Yan Guining finally recognizes Gong Liu's true appearance and discovers that the woman he has long yearned for, the person who saved his life in Qingzhou, is the very former wife he once discarded. Overwhelmed with regret, he becomes obsessed with pursuing her and tries to take her back by force, but Gong Liu has already given her heart to Jiang Mo. As the layers of truth are uncovered, an old conspiracy involving the power struggles of two generations of princely households also collapses. In the end, Yan Guining suffers the consequences of his own actions, while Gong Liu and Jiang Mo spend the rest of their lives together in happiness.