Seok-charm, a separated reserve chief, is an obsessive worker and separated father to his young little girl, Soo-an. As a feature of her birthday the following day, she wishes for her dad to take her to Busan to see her mom. Albeit hesitant at first because of his work, however his mom persuades him by demonstrating a video of her singing an Aloha, in which he couldn't go to. While in transit to the station, they about collide with a line of speeding flame trucks, emergency vehicle and a squad car, and notice a consuming working out yonder. They board the KTX in Seoul. Others on a similar prepare incorporate intense regular workers spouse Sang-hwa and his pregnant wife Seong-kyeong, a secondary school baseball group, rich yet narrow minded CEO Yon-suk, elderly sisters In-gil and Jon-gil, and a vagrant who is by all accounts mindful of the circumstance happening.

As the prepare withdraws, a writhing young lady sheets the prepare with a chomp twisted on her leg. The lady turns into a zombie and assaults a prepare chaperon, and the disease rapidly spreads all through the prepare. Seok-charm gets a call from his collaborator to caution him that 'rough uproars' have emitted in Korea. Baseball player Yong-guk, his adoration intrigue Jin-hee, and a few travelers figure out how to escape to the upper compartments. Sang-hwa attempting to blockade the entryway, however then understands the zombies don't know how to open it, and just charged at sight of people. Seong-kyeong utilizes water and the daily paper to conceal the windows, which traps the zombies into supposing they are not there. News communicates report zombie episodes all through the nation. The conductor consoles over the radio that prepare won't got to Busan, yet will stop at Daejeon Station, as he was educated that the city has been set under the military isolate. He likewise illuminates that all travelers who land at Daejeon will be isolated. Seok-charm calls his colleague to instruct him to lift him and Su-an up so they won't be isolated. The prepare stops at the Daejeon, whatever is left of the travelers make a beeline for the primary exit, while Seok-charm, Soo-an and going with vagrant go to corridor. Be that as it may, the majority of the survived travelers find the troopers has all been tainted, demonstrating that the organization has fizzled. what's more, all the while, the gathering winds up isolated from each other. Soo-a, Seong-kyeong, Jong-gil and the vagrant make a beeline for the lower compartments, and they blockade themselves in the washroom. The conductor restarts the prepare to make a beeline for Busan, where an effective isolate zone has supposedly been set up.

Finding that the surviving travelers are as yet caught in the lower compartments with swarms of zombies still there, Seok-charm, Sang-hwa, and Yong-guk battle their way to the restroom to protect Soo-a, Jong-gil, Seong-kyeong, and the vagrant. Amid their way, they find that zombies can't see the uninfected individuals oblivious and they just respond to sounds. They utilize this preferred standpoint to protect the others and together they make a beeline for the principal compartments. In any case, at the affectation of Yon-suk, the travelers obstruct the survivors from entering, expecting that they are contaminated. Not able to battle off the crowds of zombies coming in, Sang-hwa and Jong-gil give up themselves to give the others time to compel open the entryway and enter the auto. Seok-charm tries to dissuade Yon-suk on why they secured themselves in any case, yet Yon-suk lies and says that every one of the survivors are contaminated and the gathering requests that the newcomers disengage themselves in the vestibule. They all make a beeline for the vestibule, with Yong-guk carrying Jin-hee alongside her. As Yon-suk and different travelers continue to square them in, In-gil takes a gander at her zombified sister Jong-gil and is shocked at what she had done to herself. Not able to acknowledge her destiny, In-gil opens up the entryway, permitting the swarms of zombies to enter and contaminate whatever is left of the surviving travelers.

The conductor gets a call from Busan to caution that city has figured out how to battle off the zombie disease. A blocked track at East Daegu prepare station compels the survivors to stop and look for another prepare. Simultaneously, Seok-charm, Seong-kyeong, Su-an, and the vagrant are isolated from Yong-guk and Jin-hee. Far off suk escapes in the wake of pushing the prepare specialist to be eaten by the zombies. Entering the prepare where Yong-guk and Jin-hee are, he hammers Jin-hee off the beaten path in a frenzy to achieve the other entryway, executing her. Sorrowful, Yong-guk remains with Jin-hee and is nibbled by her when she turns. The prepare conductor begins a train on another track, but at the same time is killed by zombies while attempting to spare Yon-suk. The vagrant penances himself to let Su-an and Seong-kyeong escape with Seok-charm into the prepare the conductor had enacted. They experience Yon-suk in the motor room, very nearly transforming into a zombie Seok-charm battles him off, as he has recently completely changed, yet is himself nibbled. He puts Soo-an and Seong-kyeong inside the motor room and imparts his last words to his girl before moving outside. As he zombifies, he thinks about the first occasion when he held his little girl in his arms, and diverts himself from the train with a grin.

Su-an and Seong-kyeong get off at passage before Busan after the prepare is closed off by flotsam and jetsam on the track and start strolling through a prepare burrow. On the opposite side of the passage, the fighters are positioned to guard the border against zombies. Not able to see the fresh debuts unmistakably in dull, the troopers at the checkpoint are told by their authority to shoot them both. Be that as it may, the warriors then hear a tyke singing, which makes them understand the newcomers are human: it is Soo-a, sorrowfully singing the melody that she had needed to perform for her dad toward the start of the film.