Responses
I can't really pinpoint but this fits your description, well hopefully.
https://www.mangago.me/read-manga/welcome_to_the_rose_manor/
its not this one but thanks im js gonna read this now(⌒▽⌒)
this one thriller and the only thing i remember is that the fl is red haired and the manhwa setting is historical and the art is magnificent (so vague ik )