The Poisonous Princess

She was a brilliant doctor of medicine and poison in the 21st century, as beautiful as she was skilled. After transmigrating, she became the unloved legitimate daughter of a marquis's household. She was not the brightest, and to make matters worse, her younger sister stole the man she loved. But none of that mattered. What did matter was that she'd caught the attention of the Prince of Zhen'nan!

"Hey, I already cured your leg. Why are you still clinging to me?"

The prince feigned weakness and pointed at his heart. "My leg is better, but you've given me an even more dangerous sickness here."

Ming Yan: What a nutcase!