I dedicated eight years to help him rule his empire, only for him to send me to my death by burning!

My last wish before death was to be reborn so I can change my fate, and not make the same stupid mistake again!
However… I was reborn into the body of my sworn enemy?!

My revenge plan is proceeding smoothly, but a prince suddenly appeared and proposed marriage? Does he not know I already have 4 prince consorts?