The Legendary Villain Princess

I dedicated eight years to helping my beloved one ascend the throne, but in return, he killed me by burning me at the stake! Before my death, I made a wish to get reborn and change my fate, and I swore I'd not make the same stupid mistake again! However, I got reborn into the body of my sworn enemy! In addition, the son of a prince showed up suddenly and wanted to marry me, while I was doing well with my revenge plan! What's wrong with him? Does he not know I already have four consorts?