you are a high school student in Seoul. A virus has spread around the school and turns people into something similar to zombies. You run away with a small group to the roof of the school and wait there for any help. A military helicopter came to pick you up and took you to the military base. When your father (who is an army commander) found out about what happened at school, he was very worried and waited for you on the roof of the military base (near the place where the helicopter will land).