After Rebirth, the Crown Princess Became the Emperor's Bai Yueguang

I was once the legitimate daughter of the Duke of the country, the fiancée of the prince, and I was doted on by thousands of people. It wasn't until the real legitimate daughter returned that I realized that I was just a substitute. On the day I got my hairpin, I died with hatred, my soul attached to the hairpin, watching my sweetheart marry her, and watching her make all the changes in the palace. Five years of ghost time have allowed me to see through everything - including the loneliness in the eyes of that cold-faced emperor. Three months before I was reborn, if the prince is willing to betray me, I will marry your father. In this life, I will be your mother-in-law.