Part 3/8:
As Seok-woo and Soo-an board the train to Busan, tension quickly escalates. A hurt girl with a bite mark makes her way into the train, which serves as a harbinger of the chaos that soon ensues when she turns into a zombie and begins attacking passengers.
The train, packed with various characters, becomes a microcosm of society, showcasing the differing reactions to crisis. The chaos quickly escalates, with zombies overwhelming carriages and the passengers scrambling to escape the fast-approaching threat.