The Prince Is Poisonous: the Official Daughter of the Prince Is Very Sick and Spoiled

It was said that the eldest daughter of Duke Ding's house was frail and sick, lived in seclusion, and was not going to die soon. The prince and grandson were extremely intelligent, but he was short-lived. Little did they know... "I see that the young master is poisoned and has no control over his life. I am in a good mood today and can save you." "How did you know I was poisoned?" "I can see it right away. Do you want treatment?" "Yes!" The yandere and the sickly are indeed a match made in heaven.