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.

In 1980s Italy, a relationship begins between seventeen-year-old teenage Elio and the older adult man hired as his father's research assistant.

When a zombie virus pushes Korea into a state of emergency, those trapped on an express train to Busan must fight for their own survival.