When a tunnel collapses on Jung-soo, his ensuing rescue operation becomes the subject of widespread media coverage and frenzy. But days go by, nerves stretch thin, and Jung-soo must struggle for his life in the suffocating darkness alone.

A father and his son are two of the last remaining people on earth after an unexplained tragedy has destroyed most of life. As the two head south, they are faced with many trials and tribulations along the way. An intense bond between the father and son is formed as together they strive to not only survive, but to retain humanity as they help the people they encounter along the way.

Inspired by the incredible events surrounding an attempt to reach the summit of the world's highest mountain, the film documents the awe-inspiring journey of two different expeditions challenged beyond their limits by one of the fiercest snowstorms ever encountered by mankind. Their mettle tested by the harshest elements found on the planet, the climbers will face nearly impossible obstacles as a lifelong obsession becomes a breathtaking struggle...