Dr. Li tells the doctor that he is in the palace because he needs a doctor. The doctor tells him that he will give the prince the cause of the plague, but that he has only written a few prescriptions for clearing up heat and detoxification. He says that he hopes that the highness of the patient will help him find the root cause. He also says that if the plague is not relieved in the city, there will be an increase in the number of people outside the city.