Ki-taek's family of four is close, but fully unemployed, with a bleak future ahead of them. The son Ki-woo is recommended by his friend, a student at a prestigious university, for a well-paid tutoring job, spawning hopes of a regular income. Carrying the expectations of all his family, Ki-woo heads to the Park family home for an interview. Arriving at the house of Mr. Park, the owner of a global IT firm, Ki-woo meets Yeon-kyo, the beautiful young lady of the house. But following this first meeting between the two families, an unstoppable string of mishaps lies in wait.
In a future where a failed global-warming experiment kills off most life on the planet, a class system evolves aboard the Snowpiercer, a train that travels around the globe via a perpetual-motion engine.