Responses
Don't know about the dreams and fated stuff but this one is similar, MC is reborn as ogfml older sister.
Reborn As a Character That Never Existed manga - Mangago https://www.mangago.me/read-manga/reborn_as_a_character_that_never_existed/
This wasn't it But thank you for the suggestion!!
YEP THIS IS IT THANK YOUUUSS!!
-Historical manhwa
-MC and ML both have platinum blond hair from what I remember..
-Mc got reincarnated as The og FLs sister that never existed
-Before reincarnation MC kept getting dreams of ML crying or suffering, So mc in the dreams says she wants to help him
-In the story like when u develop a pattern on a certain part of your body you have a matching one w your fated to be, if you don't marry your fated one you die? I think
-ML was a villain in the og plot...?
-ML hates MC at first
Thats all I can remember but I remember reading this during peak quarantine