Intro. story takes place in a school in South Korea called Hyosan High School. It all starts when a teacher creates a virus during an experiment to try to protect his son from bullies. However, the experiment goes wrong and creates a virus that turns people into zombies. The virus starts with an infected student and quickly spreads throughout the school. Before long, students and teachers are attacked and turned into zombies. The school gets completely out of control. A group of students manage to survive and become trapped inside the school, trying to find ways to escape while zombies are everywhere. They must fight to survive, look for food, help injured friends and try to warn the outside world about what is happening. Meanwhile, the virus begins to spread throughout the city. The government and the army try to control the situation and save the survivors, but the danger increases each time