It’s little Su‑an’s birthday. The girl lives with her father in Seoul and really wants to go to her mother in Busan. As soon as they set off, a zombie epidemic breaks out in the country. The passengers on the train to Busan — the only city that has withstood the virus attacks — will have to fight for survival. 442 kilometers to go. Welcome aboard, and remember — surviving in this race isn’t enough to stay human.