Min says that her hospital will cooperate with the UDC on the epidemiological investigation. However, the doctors in the hospital are told to persuade the patients and their guardians not to fill in the questionnaires from the UDC. Joong Eun comes to visit Do Yoon's house to check if he has fallen ill due to an environmental factor. She finds the possible cause of Do Yoon's disease. (Source: Kocowa)