The Conveniently Innocent Villainess

It was a classic tale. The Crown Prince is forced to marry the evil Count's daughter, only to fall hopelessly in love with a Baron's daughter. After overcoming the cruel schemes, bullying, and even assassination attempts from the Count's daughter, the male lead and the heroine are wedded instead, and the evil Villainess and her accomplices finally pay for their crimes....at least that's what's supposed to happen. But... What if... The so-called Villainess got into an accident....a terrible accident that left her unable to remember..anything at all. Completely helpless, like a 5-year-old child, the Count takes it upon himself to wed her to the Monstrous and Bloodthirsty Duke in order to protect his now recovering childlike daughter. In a world that is trying to right its wrongs, can this Duke protect his now innocent-like wife, and can they ever have a regular marriage, one that adults have?