The Poisonous Young Master: The Duke's Legitimate Daughter Is Sickly-Sweet

Everyone says the eldest daughter of the Duke of Dingguo's household is frail and sickly, rarely leaves home, and doesn't have long to live. The Crown Prince's grandson is exceptionally clever, but alas, he's also short-lived. Little do they know... “You look like you've been poisoned, and your life is no longer in your own hands. I'm in a good mood today, so I can save you.” “How do you know I've been poisoned?” “I could tell at a glance. Do you want me to treat you?” “I do!” A yandere and a sickly beauty really are a match made in heaven.