Soon to be married, Eun-su heads to Gangneung to see her long-lost father. The old seaside town has changed dramatically from the one in her childhood memories. Exhausted from the sweltering heat of August, Eun-su gets into a taxi.

Five years into the company, Hye-in is still the youngest. The business report shall be made to the monk in charge of correction and correction of the publisher of the temple. Thanks to the rush of work and customers testing their patience, they travel back and forth between paradise and hell a day.

Dowoo runs an old motel – adjacent to a lake with thousands of Korean War victims at its bottom – as well as caring for his mother who has dementia. One wintry day she disappears without a trace. In her stead, a cute little dog appears. Everyone helps kind-hearted, somewhat shy Dowoo search for her. However, when his mother isn’t found, rumours arise that he may have killed her. Has he started having doubts himself? It doesn’t help that he swallowed her tranquillisers on the day she went missing, and can’t remember a thing.

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.

A group of unlikely heroes from across the Korean peninsula try to save the day after a volcano erupts on the mythical and majestic Baekdu Mountain.