While a zombie-virus breaks out in South Korea, a couple of passengers struggle to survive on the train from Seoul to Busan.

Korea is ground zero for an undead pandemic, as one man's rotten trash brings on a zombie apocalypse. A high-tech repairman struggles as a robot residing in a Buddhist temple finds his higher mind and challenges the idea of consciousness. And one family, one lost billiard ball, and one misguided Internet order bring on the end of the world.

Gangnam, an upscale neighborhood in Seoul, becomes the center of mass chaos when residents begin to experience terrifying symptoms that turn them into strange, inhuman creatures that begin to attack. A man and woman are among the remaining few not infected and must risk everything to escape the zombie onslaught.