Jeong-won (Lee Sun-kyun) and his daughter are on their way to Incheon Airport when a thick fog causes a massive chain-reaction crash on the airport bridge. They get stuck in the chaos with a group of people including a brash-yet-harmless tow truck driver (Ju Ji-hoon). Things take a turn for the worse when mutated military dogs are accidentally released from their transport vehicle and start preying upon humans, putting the group in a terrifying life-or-death situation.As the bridge is shut down, it is now up to Jeong-won aided by the other survivors to figure out a way to make it through the night while uncovering the conspiracy behind the dogs.