Doctor John

Cha Yo-han, a genius professor at Hanse Hospital’s Department of Anesthesia, has a very rare medical condition where he cannot feel any pain. One day, as he is performing surgery on Yoon Seong-gyu, a patient with anal cancer, Cha Yo-han gives him a small amount of a painkiller drug to reduce the pain but ends up euthanizing him. Yoon Seong-gyu was actually a criminal on the death row for being a serial killer who had murdered many young children. Son Seok-gi, a prosecutor who had lost his own child to Yoon Seong-gyu, arrests and indicts Cha Yo-han.