Survivors from a massive earthquake struggle for a new life in Seoul.

Lee Yeo Reum gets dumped by her boyfriend and, soon after, her mother dies in an accident. She goes through one of her worst moments in her life. Lee Yeo Reum then makes the decision to live a complete different life from before and not do anything. She quits her job and moves to a small village, where everything is strange to her. There, she meets the residents, including An Dae Beom, and gets to know them. An Dae Beom works as a librarian. He hardly talks to people, but, when he does, he talks with a stutter. Somehow he gets comfortable and happy being with Lee Yeo Reum. Throughout this time, Lee Yeo Reum also discovers who she really is.

While investigating a terroristic threat that goes viral online, Korean authorities discover that a suspect has recently boarded an international flight bound for the United States. When a healthy passenger on the same flight suddenly dies a gruesome death of unknown cause, panic erupts both in-flight and on the ground. With steadily decreasing fuel and international refusals to offer aid, the captain and crew will be forced to take unprecedented emergency measures in an attempt to save the lives of their passengers.