How do you stay standing when a failed lab experiment causes a deadly apocalypse? And how do you deal when the person you're stuck with for the long haul is your worst nightmare? When Min-ji happens to get saved by her next-door neighbor, Raeda, during a showdown with death, she is forced to stay with him in order to survive. They see each other as annoyances for a long time but, as time passes, they realize they might have more in common than what is seen on the surface. Will they get past their differences and find out how this all began, or will they rip out each other's throats before they have the chance?