An "unexpected" transmigration turned her into a strange Mary Sue. ...
"It's not that I don't like you. I just don't want to be heartbroken. Men are fickle, and one day you'll have three wives and four concubines. When that day comes, will your heart still belong to me? Put another way, once you have three wives and four concubines, will you remember me at night? Or if you spend the night with me, will your heart be with me too?"
"Please listen carefully. I know men are fickle, especially emperors. Three thousand beauties in the harem, all of his favor bestowed on one. That's something no woman would dare dream of. I can accept you spending the night with someone else, as long as your heart spends the night with me. When I'm old and my looks have faded... when that time comes, will you still keep me in your heart? When you sleep at night in another consort's chambers, will you still remember me? Even if you spend the night with me, will your heart still be with me?"
She didn't understand what had happened, but she knew she was wasting her life. Only after she was exhausted in body and mind did she begin to reflect on herself.
P.S. I locked the novel earlier to fix bugs, and revised it starting more or less from Chapter One. I recommend rereading from after Chapters Nineteen and Forty-Eight. I'll unlock the whole novel once it's finished.