A celebrity influencer couple built on a fake happy marriage, and their neighbours—a doctor couple locked in a brutal divorce—spiral into a chaotic chain reaction when they are bound by a secret so unmanageable that it makes affairs look trivial.

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.