Why She Lives as a Villainess is a Manga/Manhwa/Manhua in english language, Manhwa series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.nl fastest updating comic site. The Summary is

I reincarnated into the body of the main character, the villainess. This was before the villainess went back in time. I know the original plot anyway. I don’t have to go back in time and redeem myself, do I? Let’s just destroy the original plot while looking for a way to live. In my own way, obviously. *** “Are you going to eat in such an inappropriate way?” At the Marquis’ words, Lesian responded carelessly. “The ancestors used to say that you should treat others the way you want to be treated. You say it’s impolite for me to eat in my pajamas, but it doesn’t seem like the Marquis treats his daughter politely either?” At those words, the Marquis shouted angrily. “You must have finally gone crazy!” “Yes, I am crazy.” Is it a big deal to say that I’m crazy anyway when I’m currently possessing a villainess’s body?