The homeless man sacrifices himself to buy time for Seok-woo to clear the debris and Su-an and Seong-kyeong to escape onto the new locomotive.

The rest of the group is trapped again by falling debris. A flaming locomotive derails and traps the remaining survivors, but Seok-woo finds a way out. The train conductor starts a locomotive on another track, but is also thrown to the zombies while trying to save an injured Yon-suk. Heartbroken, Yong-guk stays with Jin-hee until she turns and kills him. Yon-suk escapes after pushing the attendant into the zombies, then later does the same with Jin-hee when they run into each other on the tracks. Yon-suk and a train attendant escape by hiding in the bathroom.ДЄ blocked track at the East Daegu train station forces the survivors to stop and search for another train. However, Jong-gil вЂ“ disgusted at the passengers and despairing for the loss of her sister вЂ“ deliberately opens the other door and allows the zombies to enter and kill the rest of the car's passengers. Yon-suk and the passengers demand that the survivors isolate themselves in the front vestibule. Sang-hwa sacrifices himself to give the others time to force open the door and enter the car, but In-gil also does not make it. At the prompting of Yon-suk, the passengers prevent the survivors from entering, fearing that they are infected. Once regrouped, they struggle through the zombie horde to the front train car - where the rest of the passengers are sheltered. 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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