Tin, an ER doctor, is familiar with losing patients due to his line of work. But what happens when he is given a second, third and countless more chances to help a young student survive?

Tin is a third-year resident physician in emergency medicine who deals with a wide range of patients who circle the emergency room every day until the night of the 18th. His life changes when Tol, a male student who was pushed into the emergency room in a serious condition. That night wasn't just the the night that he couldn't save him. Because when he wake up, he found himself trapped in a time loop.