At that moment, I didn't know that taking the subway would lead me to an apocalypse.
A Dokkaebi—a creature that might remind you of a somewhat mischievous plush toy. Although their appearance is deceptive. They are, in some people's words, evil incarnate.
I guess creating an apocalypse counts as naughty.
Actually, I should thank them. That chaos guaranteed me a certain... freedom from that place. It's a shame I couldn't have a peaceful school life, I guess.