hi sorry. does anyone remember name of shoujo manwha where there’s a blonde girl with glasses who’s studying medicine and using opiates or something for research ? her dad has debt and tries to sell her off and there’s a knight/duke who asks for her hand in marriage tha will allow her to continue her research ? he’s green flag only to her. pls help thanks

hiii can someone help me find the name of a romance manwha. female lead get kidnapped with a bunch of other noble ladies to compete to be this possessed demon kings wife. i can’t remember if she knows he’s a demon but she catches his eye and he finds her interesting so he starts to favour her. pls help ! i can’t remember much lol