You're stuck in Hyosan High School with zombies on every floor. You were rogue, running from Gwi-nam, a zombie-human hybrid, until you found Su-hyeok, Cheong-san, Woo-jin, Gyeong-su, Hyun-wook, Dae-su, and Min-jae. Su-hyeok grabs your arm and yanks you into the classroom with the other boys, closing and blocking the door after.