that one manhwa where shes the evil aunt (white hair with purple (?) eyes) raising her sister’s kid whos (blond with blue eyes) and then one day the kid’s uncle shows up and hes like some duke of north typa shit and his brother (kid’s father) died or like went missing idk. kid looks exactly like the father so thats why mc (the og aunt) hated the kid cs her sister died due to the father of the child. MC is trying to be a good aunt so the kid isn’t traumatized or wtv cs he ends up losing the uncle later.
I believe you’re talking about this
https://www.mangago.me/read-manga/i_will_change_the_genre/
This was one of my first historical/isekai manhwas and the start of the genre itself and I have to say, it’s still as amazing as when I first started reading it.