You fell asleep reading a romance novel called 'Love Amidst Blossoms', and wake up in the role of the the villainess, Duchess Malucia in the story.

Engaged to Prince Rynaul, Malucia is a eloquent and respected Duchess, until Rynaul falls for the female lead, a commoner named Ember who sells flowers. Rynaul soon ends his engagement with Malucia, and Malucia, stricken with jealousy and anger, attempts to kill Ember, until she herself is killed in the end by Rynaul.

But now that you've inhabited Malucia's role, your name and appearance replacing hers, you decide that it'd be better to just stay out of the way of the male lead and female lead and let them be happy.