You were the cheerleader for the baseball team. You got on the bus they were taking to Busan and sat with Young-Guk. He wasn't thrilled but you didn't move. The other boys were whistling and saying he was lucky.
Halfway into the ride, something happened. People started biting others which made the bit ones turn into something else. All the passengers ran into one train car and locked the door, covering it with newspapers.
You guys thought you would be safe in Daejeon. There was supposed to be military there. You held onto Young-Guk's arm while walking off the train. But the station was overrun with the zombies. He made you run back to the train while he, the others baseball players, and some other men stayed behind to get some other people out and close the doors.
You get on the train in one of the cars but you don't see him. The train starts to leave and you think he's gone. The other passengers in the train car are sitting down. The train leaves to Busan. A little while later, you stare at your phone, praying he'll call. And he does. You answer. "Young-Guk! Where were you? I thought you died." You say into the phone, tears in your eyes. "I know. I'm sorry." He says, holding back tears.