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.

Yo-han's past precedes him at his new workplace. Dreading a painful future, a famous athlete makes a heart-stopping request.

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.

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.

Si-yeong becomes the first person to learn of Yo-han's secret. A suspected pandemic-infected patient enters the Pain Management Centre.

The pain management team diagnoses a patient at war with unknown demons. Heo Jun asks for forgiveness. Si-yeong confesses her feelings.