Five friends whose friendship goes back to their days in med school are brought back together when a phone call interrupts each of their busy lives.
For the first time in 20 years, everyone's finally working under the same roof. A patient with a familiar name finds Chae Song-hwa.
The hospital's med students are inspired by the doctors, who each look after their patients in their own ways. Lee Ik-jun gets a welcome visitor.
Yang Seok-hyeong's aloofness frustrates someone on his team. Jang Yun-bok and Jang Hong-do witness a surprising side of Song-hwa outside the hospital.
Jang Gyeo-ul can't get one kind word out of Ahn Jeong-won, who seems especially cold to her. A difficult professor joins the cardiothoracic department.
Kim Jun-wan waits for a response from Lee Ik-sun, who says she needs some time. Jeong-won breaks painful news to the family of his longtime patient.