The Immoral Ducal Family Needs to Learn Family Values

I'll teach these three troublesome kids myself. Recently, a few changes have come into my life. First, I became the tutor for the siblings of the Duke of Bertha's household. Second, I regained the memories of my past life. Why am I suddenly recalling my past life now? Is this... the world from the novel I read in my previous life? If my memory is correct, as the tutor, "Estella," I’m about to face death. I have to protect the Duke's half-siblings from the notorious villain, "Diego"! "You seem to be a much better person than I thought." "You should look for work at another mansion. If you stay here, you'll go mad." But Diego, this man, whom I thought was a heartless psychopath, turns out to be surprisingly kind...? Fine then! I’ll set up a reconciliation between Diego and his half-siblings! Who could kill these adorable kids when they’re hugging you?! The project of Estella, the top-notch tutor, to rehabilitate three troublesome kids.