Doctor John ดอกเตอร์จอห์น | Cha Yo-han is a genius anesthesiologist that is imprisoned because of euthanasia. He meets a doctor Kang Si-young in jail and later in the hospital where they try to find the causes of patients' pain. Doctor John ดอกเตอร์จอห์น | Cha Yo-han is a genius anesthesiologist that is imprisoned because of euthanasia. He meets a doctor Kang Si-young in jail and later in the hospital where they try to find the causes of patients' pain.