In an interview, Yeon described the sequel as an exploration of what happens after the immediate disaster. Train to Busan was about the panic of the moment; Peninsula is about the consequence. The world has moved on. Korea is a quarantine zone, written off by the rest of the world, a lawless island where the infected roam and human decency has decayed just as surely as the infrastructure.
Four years after the world-ending viral outbreak in the original film, the Korean peninsula has become a quarantined, lawless wasteland. Train to Busan Presents: Peninsula train to busan 2 peninsula