I became possessed by a noble lady.

A story about a soul that possesses a noblewoman and lives life as she pleases. An ordinary commoner girl ends up possessing a noblewoman on the verge of death. She rejoices at being dumped by the Second Prince—but her joy is short-lived when the royal family introduces her to a new fiancé, making her the Crown Princess instead, which is far worse. A story about an unfortunate young lady trying hard to play the role of a fake villainess, desperately trying to escape becoming Crown Princess and hoping for a rival noblewoman to appear and take her place.