Set in 2031, the entire world is frozen except for those aboard the Snowpiercer. For 17 years, the world's survivors are on a train hurtling around the globe creating their own economy and class system. Led by Curtis, a group of lower-class citizens living in squalor at the back of the train are determined to get to the front of the train and spread the wealth around. Each section of the train holds new surprises for the group who have to battle their way through. A revolution is underway.

The film revolves around Park Hee-bong, a man in his late 60s. He runs a small snack bar on the banks of the Han River and lives with his two sons, one daughter, and one granddaughter. The Parks seem to lead a quite ordinary and peaceful life, but maybe they are a bit poorer than the average Seoulite. Hee-bong's elder son Gang-du is an immature and incompetent man in his 40s, whose wife left home long ago. Nam-il is the youngest son, an unemployed grumbler, and daughter Nam-joo is an archery...