help pls :(

so I remember reading a bit of this manga a bit ago but I forgot to mark it in reading and its not in my history, the male lead hair black hair and is kinda evil. I think the girl lead has red hair but I dont exactly remember. the girl leads friend is engaged to the male lead and warns the girl lead that hes evil. the girl lead has also been friends with the male lead since they were kids. uhh it's a fantasy manga and they're all lords and ladies I think. anyways the girl lead gets sick I think and the male lead brings her this drink that'll heal her but it hurts him because of his evil powers and I'm not sure if that's enough explaining but yea and I really wanna read it again. if anyone knows what I'm talking about pls tell me. thank you for taking the time to read this :)
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