Two anesthetists work together to find the cause of mysterious pain their patients suffer.
EPISODE 1
Episode 1
Hours before leaving the country, Kang Si-yeong steps in as a correctional physician and saves a life with the helping hand of Cha Yo-han.
EPISODE 2
Episode 2
Lee Yu-jun warns Si-yeong about Yo-han; when she confronts Yo-han about his diagnosis and crime, he questions the source of her anger.
EPISODE 3
Episode 3
Yo-han's past precedes him at his new workplace; dreading a painful future, a famous athlete makes a heart-stopping request.
EPISODE 4
Episode 4
Si-yeong begins to understand Yo-han's philosophy on pain management upon hearing the full account of the events from three years ago.
EPISODE 5
Episode 5
As patients fill the Pain Management Center, one in particular catches Yo-han's eye with his lack of symptoms; Son Seok-gi approaches Si-yeong.
EPISODE 6
Episode 6
Yo-han lets history convince a young patient to undergo major surgery; Si-yeong wins Yo-han's praises for finding answers through patients' stories.
Ji Sung
Lee Se-young
Lee Kyu-hyung
Hwang Hee
Kwon Hwawoon
Oh Hyun-joong
Jo Su-won
Kim Younghwan
Jang Jin-wook
Kim Ji-un