Minu and Jaein meet for the first time at Sunu's house; one of the patients dies of respiratory failure due to ventricular septal defect and Minu doesn't know how to handle the trauma.

Minu and Jaein take on their first successful transfer as interns; the professor faces a problem with the surgery he just performed and a conflict arises.

Lee Min-woo and Kang Jae-in struggle to find themselves while working in an emergency room.

Jaein finds out about Sunu's other girlfriend as he gets into a paragliding accident; Dr. Choi is barred from surgeries.

Dr. Choi decides to resign; the pair tries to do everything to save a boy who got into the traffic accident.

Minu and Jaein find the patient and bring her back to the hospital to perform surgery; Jaein's grandmother tries to send Sunu away to a different hospital.