Éminence Grise Female Lead Is Trying To Make Me Her Stepmom

I have transported as civilian 1 into the “tragic novel” I wrote with my friends for fun. Since he declares revolution in order to change his daughter's unhappy future. If I leave it like this then many lives are in danger. “I will protect the female lead!” That's how I started to live with the daughter stupid duke. But the small female lead is a bit strange for some reason.