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.

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.

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

Si-yeong begins to understand Yo-han’s philosophy on pain management upon hearing the full account of the events from three years ago.

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 Center.

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

A former actress receives treatment for a rare kind of cancer. Yo-han starts to experience worrying symptoms.

Yo-han's doctor tells him to choose between his career and his life. Min Tae-gyeong makes up her mind about her husband. A patient loses all hope.

During an investigation into a patient's switched-off ventilator, Seok-gi is surprised by the findings and Yo-han's actions.

Si-yeong embraces her role as Yo-han's guardian. A young patient returns with new symptoms. Yo-han and Seok-gi learn about each other's conditions.

Without consulting Seok-gi, Chae Eun-jeong takes matters into her own hands by publicly questioning Yo-han's qualifications to treat patients.

Seok-gi gets a tip from an unexpected source. At the disciplinary hearing, Yo-han's supporters advocate on his behalf.

Si-yeong tearfully bids farewell to loved ones. After pushing her away out of fear, Yo-han finally gives her his answer.

To Si-yeong's relief and disbelief, Yo-han reappears in front of her after three years of silence. His vision for healing comes to fruition.