Yoo Si Jin returns to Korea to attend his father's retirement celebration from the Army. The medical team have packed their stuff and is ready to leave, when suddenly an earthquake changes their entire plan.

During the rescue operation in Urk, Yoo Si Jin forces Kang Mo Yeon to make an impossible decision.

Yoo Si Jin and his squad are tasked to find the last three missing persons inside a building that could collapse at any time.