I Dumped My Obsessed Ex for a Mafia Lord

In this world a woman can be born a second time into her own past, with the first life's memory intact. Zinnia Zhou, the young lady of the Zhou family, spent that first life on the wrong man. She and Luther tormented each other for five years, and only at the end of it did she learn that the one he wanted was her adopted sister, Zara. In the second life she decides she owes Luther nothing. She cuts every tie with him and gives him back to Zara. Zara was supposed to be married off far away to Jeremy, who leads a mafia family, and Zinnia goes in her sister's place. Luther hurts her several more times in this life before he works out that it was Zinnia he loved. He tries to win her back after that.