The Final Hidden Boss Villainess Is a Healer!

I possessed the body of the villainess from my favorite novel. And not just any villainess—the terrifying one who brings about the destruction of the world! After possessing a regression-and-revenge novel, I realize I'm about to be stabbed to death by my favorite character at our very first meeting. I managed to survive for eight years in a temple while hiding from the duke’s household, but while working as an imperial healer, I ended up running into the protagonist’s older brother, Lloyd, who remembers his past life's agony all too clearly.