The medical staff of Doldam Hospital fly out in a helicopter to a ship lost out at sea on behalf of Teacher Kim, who is absent on vacation.

As the patient's lung condition deteriorates due to tuberculosis, Teacher Kim opens the trauma centre operating room for Ri Bok-young's surgery.

Doldam Hospital hires new personnel. The people of Doldam, who thought Teacher Kim would be the new head of the trauma centre, hold an emergency meeting.

Patients injured in a residential fire are rushed into the emergency room. Seo U-jin treats the suspected arsonist despite Jang Dong-hwa's criticism.

Cha Jin-man hates that Teacher Kim's methods are deeply rooted into Doldam Hospital and takes everyone except Lee Seon-ung and Dong-hwa to the trauma centre.

The trauma centre loses a patient and receives another patient in critical condition. Meanwhile, a child visits Teacher Kim at Doldam Hospital.

Wounded soldiers are rushed to Doldam Hospital. A-reum is left alone to tend to the emergency room when rogue patients suddenly cause a scene.

Patients rush into the emergency room while the staff tends to surgeries. Doldam Hospital falls into chaos as the gunman's identity is revealed.

When an old building collapses resulting in several casualties, a disaster medical support team is dispatched to the site.

Doldam Hospital receives news of a second collapse, but the place is still full of injured people. Teacher Kim leaves everything and heads to the scene.

Jin-man fails to find the culprit who broke into the director's office. His reputation is further ruined as incidents from his past become known.

Gang Dong-ju returns to Doldam Hospital, with his unconventional proposals causing a stir in the trauma centre.

Eun-jae performs emergency surgery on a non-trauma patient while she must join another surgery for a patient with multiple traumas.

People injured from a forest fire rush into Doldam Hospital. Yet, the trauma centre is empty due to the staff staging a boycott against Dong-ju.

A fire approaches as if it would devour Doldam Hospital at any moment. Only after evacuating all the patients do the staff realise Teacher Kim was gone.