Éminence Grise Female Lead Is Trying to Make Me Her Stepmom

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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.
The female lead is the stepdaughter of the mother who married the male lead, so since childhood, the male lead doesn’t like the female lead. He has a younger sister named Nhuo Hy, she loves her brother very much, so she always acts weak to win his affection.