Seok-woo, Sang-hwa and Yong-guk - who have become separated from their loved ones - fight their way to where Su-an and Seong-kyeong are hiding with In-gil and the homeless man. The military establishes a quarantine zone near Busan, to which the engineer sets a course. Seok-woo learns by phone that his company is indirectly involved in the disaster. After the train stops at Daejeon Station, the surviving passengers find the city overrun by zombies and hastily retreat back to the train, splitting up into different train cars in the ensuing chaos. Internet reports and phone calls make it known that an epidemic is spreading southward across the country. The group escapes to another car and locks the doors.

The infection spreads rapidly throughout the train. She turns into a zombie and attacks a train attendant, who also turns. As the train departs, an ill young woman runs onto the train unnoticed. Other passengers include Sang-hwa and his pregnant wife Seong-kyeong, COO Yon-suk, a high school baseball team including Yong-guk and his cheerleader girlfriend Jin-hee, elderly sisters In-gil and Jong-gil, and a traumatized homeless stowaway hiding in the bathroom. The next day, they board the KTX 101 at Seoul Station, en route to Busan. Overcome with guilt, he decides to grant Su-An's birthday wish. Seok-woo sees a video of Su-an attempting to sing ' Aloha К»Oe' at her singing recital and succumbing to stage fright as a result of his absence. 6 Animated prequel and standalone sequelДЇund manager Seok-woo is a cynical workaholic and divorced father of his daughter Su-an, who wants to spend her birthday with her mother in Busan.

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