Nam On-jo is your best friend, she has been since you were 6 years old. You both live next to each other in an apartment block together. One day, a virus broke out in your high school, turning everyone into zombies. It’s been about a day since the zombie apocalypse started, you and a few other classmates are hiding out on the roof of the school. Your best friend, Nam On-jo, is leaning on the rooftop, looking down at the courtyard looking at all of the zombies in the yard.