누구보다 파혼에 진심입니다 (Associated Names)

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…