The Legitimate Daughter, a Mad Doctor: The Dark Emperor's Beloved

A 21st-century miracle doctor and mercenary king transmigrates into the body of a foolish, dim-witted, frail young lady in the Duke Who Protects the Nation's household, a useless good-for-nothing with no talent for cultivation. For the first time, the arrogant, cool, and domineering Feng Qingjue is completely dumbfounded! Her father doesn't dote on her, her mother doesn't love her, her beloved grandfather is in seclusion, and her aunt, the empress who treats her like her own daughter, is away. Her loyal older brother, who would protect her with his life, has disappeared. At last, a pack of vicious wolves and tigers seize their chance and kill little Feng Qingjue, the family's useless runt! Hmph! Hmph! Hmph! Feng Qingjue snorts. Wolf, tiger, leopard, whatever you are, if you dare mess with me, get your neck ready. I'm coming to chop it off! Idiot? Good-for-nothing? Sickly weakling? Great! She'll show them what it means to be a peerless genius, dazzling beyond compare! She'll blind their damn eyes! But who is this sinister, cunning, wickedly charming pervert!? How dare he keep putting his hands on her and taking every advantage he can! He's asking for death!