My White Moonlight Is a Black Heart Lotus

Looking for Gong Douwen, the Scheming Heroine Drives a Wedge Between the Emperor and Bai Yueguang

After the emperor's childhood friend was reborn, she realized that the emperor was good and wanted to restore the old relationship. The heroine doesn't know whether she is awakening or going through a book, and realizes that she will be killed by the emperor. She does not want the emperor and Qingmei to be happy but she dies violently, so she unravels the plan and wins the emperor's heart.