D-Day

Risking lawsuits to save lives, surgeon Lee Hae-seong clashes with the hospital director, Park Geon.

A sudden explosion creates numerous casualties; Hae-seong, Ttol-mi, and Ji-na are all on the scene.

A 6.5 earthquake hits the city of Seoul; Hae-seong and Ttol-mi attempt to treat the injured.

There are people who are still alive under a pile of concrete; Hae-seong makes a difficult decision.

Doctors perform triage on the victims, but Director Park and Han U-jin have a different plan.

Mirae Hospital is running out of electricity, and Director Park prepares for a complete shutdown.