I Am More Sincere About Breaking Off the Engagement Than Anyone

I possessed the villainess in a typical dark romance novel. The fiancée of a duke who torments the heroine and gets executed for it, Ravenne Rischefeld. Moreover, her fiancé falls for the heroine and commits treason, only to be beheaded by the emperor! I have no intention of holding hands with you and getting beheaded together! To get out of this engagement as soon as possible, I decided to act as the ‘romance novel addict young lady who knows nothing about the world and only has flowers in her head’—the type the duke despises most. Additionally, I plan to squander the family fortune with that pure brain. But why is everything I do turning out like this? Why is everything going wrong? ...