My twin sister bullied me because she hated having two identical faces, and she left a permanent scar on my face. And then... she stole my fiancé, the Prince. My parents told me to forgive her, but... I don't want to attend the engagement ceremony.

I have been continuously told by my twin sister that she hates having the same face as me. There were even times when she pushed me down the stairs, but I was told things like "oh, how lucky that it wasn't a serious injury." I made excuses saying it wasn't intentional, but... since she was my sister, I forced myself to believe it wasn't on purpose. And after I was decided to be the crown prince's fiancée, my sister pushed me into the fireplace, and I suffered burns on my face and hands. When my parents saw the burn scars that would never fade for the rest of my life, they suggested switching me out for my sister, and His Highness agreed to it as well. My parents told me to attend the engagement ceremony... and I decided to take revenge on my sister.