Marshal law is declared when a mysterious viral outbreak pushes Korea into a state of emergency. Those on an express train to Busan, a city that has successfully fended off the viral outbreak, must fight for their own survivalâ€¦
“As long as I’m alive… there will come a day when we will meet. That’s what I thought. I don’t know if we’ll ever see each other again, but even if we do, you just need to pretend that you don’t know me. Time did pass and since we already met, let’s just pass by”.