Jae-yoon, a late military enlistee, and his girlfriend, Young-joo, break up over the phone over growing misunderstandings. But a zombie outbreak rocks the world. A national emergency is declared, a plane crashes in the city center, and Jae-yoon and his unit get trapped on top of a Seoul skyscraper. Young-joo risks the zombie-filled streets to find him. Can their love survive the apocalypse?

After decades of tension, peace has come to the Korean Peninsula. To mark the start of the new North-South Korean peacetime, top South Korean star Lloyd heads to the DMZ to perform a concert, but a misunderstanding forces North Korean special forces soldier Baek Young Ok to step in. Fans capture their interaction and the public mistakes it for a romantic moment. A scandal breaks out, and Lloyd’s fans are outraged. In desperation, he joins the military… only to find himself in a unit led by Young Ok! Could romance bloom between this unlikely pair?