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After being betrayed by her sister and fiancé, Xuan Nanyi, the princess of the demon world, made a deal with the white-haired old man. She helped her reborn and sold her soul... And when she was reborn as the emperor of the ancient Zong Kingdom, she met him, got to know him, and fell in love with him. Later, he found out that she was the gorgeous princess in the demon world and the fiancée of his prince Huangfu Huaijin...