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Concentration of Malice
Maybe it's this one
This one recently got completed it’s called “Concentration of Malice”
It was the right one. Thank you so much!!!
Exactly what I was looking for!! Thank you!
It started with the female lead in the slums and was tormeted by a noble. But the girl in the slum had a disease and passed it to the noble but when she woke up she was in the body of the noble. In the next chapter she meets some higher noble and was confused when he started groping her. I remeber her 'best friend' had blue hair. She dressed sexy and killed some dukes. the male interest had blue hair. She pretended to be sweet but would kill people. The crown prince blond hair also liked her.