Wait I think I remember one similar I'll be back I'ma find it
Youcan see if I have it in my reading or read or in the list I made
It might be this one https://www.mangago.zone/read-manga/there_is_no_place_for_fakes/ is it??
OH YES IT IS, THANKS ALOTT
YOUR WELCOMEEE, I was questioning if it wasn't it cus the dad wasn't dark skinned
So it was a girl i think his father was a duke? As far as i can remember his father was dark skinned and dark haired, the girl was not his original child and thats why one day she escaped from their house and left a letter to his fake father, once the father read the letter he was furious and immediately ordered everyone to find the girl! TT pls help me find it huhu, im not sure if thats really what happened but it has that concept!!! Help meee!!! ヽ(`Д´)ﾉ