"Maybe you're Patient Zero and we didn't notice. Still, I'll blame the timing on you."

Trapped aboard a train overrun by the infected, you and Sang-hwa have become stranded in a single car between two hordes, with no clear way to escape. As you attempt to rest and recover from a high fever from an unrelated illness, Sang-hwa keeps watch and tries his best to lighten the mood for you.

Based on Train to Busan! Highly recommended, by the way.