Looking for a novel I read a while back but can't remember the name. There was a reborn female protagonist who lived in a big family and she had an older sister who was being raised to marry into the Imperial family. The older sister wasn't a bad person, just kinda dignified. I recall there was something with a renowned teacher choosing students and all the girls in the family went, but only MC and her older sister really lasted. One sister pretended to be sick, the other was just a brat. I also recall there being some other noble girl who was apparently reborn and tried to take out MC and her sister in a raid of the family's manor. (Sorry if I'm spoiling this for anyone with the info, I just can't seen to recall the name after waiting for updates, so I wanna add as much as I remember to narrow it down!) If anyone knows the name of this novel, please let me know.