The Immoral Duke Needs to be Homeschooled

Recently, my life has undergone a few changes. First, I became the tutor for the siblings of the Bertha Ducal House. Second, I regained memories of my past life. Why am I suddenly remembering my previous life now? Could this place really be... the world of that novel I read in my past life? If my memories are correct, as a tutor, I will soon meet my death. protecting the duke’s illegitimate siblings from Diego, the most notorious tyrant of his time! "You seem to be more decent than I expected." "You should look for work in another household. If you stay here, you’ll lose your mind." But this man, Diego— I thought he was a heartless psychopath, but… He’s surprisingly kind? Fine. In that case, I’ll arrange a dramatic reconciliation between Diego and his half-siblings! How could he possibly bring himself to kill such adorable kids?