Responses
I think it’s this one
http://www.mangago.zone/read-manga/i_became_the_ugly_lady/
sadly it's not this one but ty!
I dont remember much but it was about a girl who went into the novel she was reading and became the younger sister of the female lead (the older sister had gray hair I think)
-She was also given a black haired "slave" boy to be her knight and she had to slowly win him over.
-She also had a teacher who was older than her and had long white hair I think?
-and when the older sister (female lead of the novel) tried to talk with her father the emperor he didnt like her and would tell her to get out of his sight n stuff
Anyways pls help me find this!!