I Became the Second Personality of the Villainous Heiress

I transmigrated into a fantasy novel I had read before my death.

Not as the protagonist, nor as a passerby, but reincarnated as the villainous duke’s daughter who provoked the protagonist, only to be humiliated, fell into dark magic, and was ultimately defeated as a monstrous fiend.

Heh… Did they think this would scare me?

That’s right, as long as I rely on my knowledge of the original story, with foresight and every advantage, I can surely avoid…