The Evil King's Favorite: the Miracle Doctor's Concubine

(Completed) He is the evil prince, the king of the night. She is a humble concubine with unparalleled medical skills. She accidentally saved him, and he said: I can't repay the kindness of saving my life, so why don't I pledge myself to her? I will trample those who bully you under my feet. If you like it, I'll do my best for you! If you don't agree again——