Responses
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I'm pretty sure it was Justice Of A Villainous Women, but if not, I know that I've read it and it should be in the short list I made.
http://www.mangago.me/home/mangalist/953131/
I hope that helped!
Please help me find that manhwa, it has been on my mind I read it before but I forgot the title. I only remember that the female protagonist is very smart and there’s that one scene she said how beneficial the oil is and debated that arrogant noble? And there was a bet for that debate, that female lead is with the male lead too, he is also smart. So i think that female lead is reincarnated because she seemed to know that oil would benefit in the future.