Reborn in an Otome-Game

A genius doctor from the modern times found herself reborn in a fantasy world ; Magic , kingdoms, Elves, Magical Beast, Dungeons,.... BUT it's also the world of an Otome-Game, and she got reborn as the villainess' easy-bullying younger sister , the Duke's illegitimate daughter.
From a pitiful and bullied young girl to a cold and vicious young lady .
Even a side character could surpass the main characters .