LF manwha

Its this one shoujo manwha where the MC is a young girl. The kid has three sisters, and I think she read a 'fairytale book' that supposedly told her future. She's in bad health and tries to change the future of her sisters iirc?? None of them were ogFL though. The three sisters each have a corresponding 'ogML' they're hinted at probably getting together with later in the story whom are all a bit morally dubious. I think two of the ogMLs were acquainted with eachother (prince/noble and knight) while the other was either an archmage or a very strong sorcerer. They all try to win over the little sister's trust anywayshopefully this explains it well