After an accidental traffic accident, the wild deer, who was knocked down to death, began to twist his body and suddenly stood up. In order to cover up the facts caused by this unheard of virus, the government reassures the citizens, falsely claiming that there will be no problems with their safety.
In the quiet morning, the passengers boarded the KTX406 train bound for Busan for their own reasons. There is Shi Yuplayeda fund manager who has recently separated from his wife and has a higher priority than her daughter . On the birthday of her daughter Xiu An, Shi Yu brought back the same birthday present that was repeated on Children's Day during his busy. When Xiu'an insisted on visiting her mother in Busan, Shi Yu had to put aside all his work and set foot on the train in the early morning so that he could return to the company in time for noon. There are going to be a father with carriages, with a pregnant wife Mukdenornaments) to Busan wrestler Shang Huaornaments), college baseball player Rongornaments) and cheerleader Jin Hee). Xiu'an saw a strange scene when the train was moving, but no one believed her. At the same time, a strange man stepped on the train without being noticed. In order not to disturb her tired father, Xiu quietly went to the bathroom by herself. She was pushed aside by the uncle who was guarding the bathroom door for her pregnant wife in front of the bathroom and had to go to another carriage. At this moment, the woman who got into the car in a hurry fainted, and suddenly climbed onto the flight attendant's back and bit the flight attendant. The flight attendant who was bitten in an instant spread the virus to his body and became a brutal infected person.
Shi Yu, who was called and woken up by a subordinate of the securities company in his sleep, discovered that Xiu'an was missing, and his daughter was not found in the bathroom, but he saw a terrified man rushing over. The carriages were in chaos, and the infected persons spread rapidly in the closed train. Shi Yu, who was rushing with her daughter, saw the pregnant Shengjing couple running over. They were about to close the car door. Finally, the Shengjing couple reluctantly squeezed into the car. Shang Hua asked Shi Yu to settle accounts. Jing persuaded it. Everyone fled between the narrow trains, and found that the infected person could not open the door of the car himself, and only reacted to sound and light energy. It has been learned from the broadcast that Asan Station where the train will stop at the next stop has also been occupied by the infected, and the train can only reach Daejeon Station, which has been arranged to suppress the army of the infected.
People walked in the direction indicated by the conductor, and Datian Station was unusually quiet. When Shi Yu was in the car, he secretly asked the military administrator he had managed by phone. Knowing that Datian Station had been lost, he took Xiu'an to another channel. When Shi Yu asked Xiu'an to stay for a while and walked to observe first, how could he know that all the soldiers had been infected. However, at this time, Shi Yu was too far away from Xiu'an. Fortunately, Shengjing and his wife took him away from Xiu'an in time, and Shi Yu He barely avoided the infected person and entered the door.
Faced with the continuous spread of the rampant virus and the flood of infected people, everyone on the train fought back.
