I Kill the Main Character After I Quit Marriage

Emily was a doctor of medicine and pharmacy. Unfortunately, she died in the research room all of a sudden. When she opened her eyes again, she turned into a notorious vicious supporting actress in a love novel.
She was a block in love between the hero and the heroine.
After she got her sister's boyfriend, she was even shamelessly pregnant with another man's child.
In the end, she died of dystocia during the delivery.
Emily frowned deeply. She didn’t want to be a notorious vicious supporting actress anymore. She would quit!
She just wanted to raise her daughter well and find out who killed her son and cure the pitiful and cute little boy.
But her fiance's family refused her to break off the engagement.
A popular star expressed love to her in the street with flowers in his hands.
The technology tycoon showed his love to her crazily on social media.
Things happened one after another. The witnesses died one by one. Emily seemed to be in a fog.
Wait, why did this mysterious man who had only appeared in the book a few times wanted to marry her?