Pls help find this manga

Need help...
I seriously need help..... I have this manhua..that I have no recollection of except some minor details...help....
So the plot was the female lead is reincarnated (maybe) can't remember....and her younger sister take away the current bf or fiance... And then she as in fl goes to this male lead who is feared by everyone..he's know as a monster duke who is scary and people avoid him and nt many people know how he looks)......and ask him to be together with her....bcoz if nt she is somehow gonna die..I guess..

And the only thing that is oh so dame clear in my mind is the very last thing I read...it was the ml goes to see someone from high authority then him (maybe the fl father ) and the bitchy sister who is blonde by the way...is there and she sees the ml and she gets memorize by his beauty (but she dont knw who he is ..just that he is beautiful.... ) the ml has black hair I guess....sorry cant remember.

But the ml glare at her and don't gives two shit goes on his way ...they cross path in the hallway and she is only there bcoz she wants to find more info about her sister and like how to destroy her(fl)

So I'm really lost and its annoying... Coz is there in my mind but I can not remember it...it really pisses me of..... So someone help anybody...
THANKX