At the age of eighteen, she is no longer the golden princess, but a strong woman who is responsible for the safety of two families. Every move in the harem was thrilling, and the new emperor was no longer the fourth brother who doted on her. He had become unpredictable. This man's tenderness for her even surpassed that of the prince and the seventh prince. She was determined to keep her heart sealed, but she was shocked to find that she was falling into his "love". Did he really love her? She was the only one in the world who would doubt it. Even though he helped her rise step by step, even though he made her son the prince, even though her brothers were all made kings, even though the concubines who opposed her were severely punished, even though she was infamy for her large-scale construction projects, even though... Finally, ten years later, everything suddenly changed. After ten years of laying the groundwork for his growing ambition, he began to eradicate those who threatened him, and the first one to bear the brunt was her family. But now she has completely fallen in love with him! Faced with the seventh brother who has been in love with her for nearly twenty years and wants to make a coup for her, the fourth brother who has loved her more than anyone in the past ten years, and the young general who was used by her but was willing to do so, how should a beautiful lady of a generation make a choice? To whom is the oath of three lives and three lifetimes made to?