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...
Na Kyung-soo, a diver, is angered to learn that the Coast Guard is assigning responsibility for the death of a fellow diver during the Sewol ferry disaster recovery to Ryu Chang-dae, the representative of civilian divers, and charging him with manslaughter.
Byung Do, his brother who lives like a scoundrel and was close to detective Kang Pil comes back after being stabbed by 'Submarine' ten years ago. A contractor on Jeju suggests that if there's someone who wants to find someone, one can earn a lot and so, Kang Pil who was financially challenged...
