Im Jae-hyuk as Yang Dae-su, a student of Class 2-5 and Woo-jin's best friend.
Jeon Bae-soo as Nam So-ju, captain of the Hyosan Fire Station rescue team 1, and On-jo's father.
Lee Kyu-hyung as Song Jae-ik, a detective of Hyosan Police Station.
Kim Byung-chul as Lee Byeong-chan, a life science teacher and creator of the virus, serving as the series' overarching antagonist.
Lee Yoo-mi as Lee Na-yeon, a wealthy but arrogant student of Class 2-5 who considers herself better than the others, and often looks down on Gyeong-su.
Yoo In-soo as Yoon Gwi-nam, a violent student who bullies other students and serves as the series' main antagonist.
Lomon as Lee Su-hyeok, nicknamed "Bare-su", a student of Class 2-5, a former member of the delinquent group, and a skilled fighter who aspires to join the military.
Cho Yi-hyun as Choi Nam-ra, the class president of Class 2-5, she is studious and is known for her cold attitude.
He is a selfless boy who often puts the welfare of others before himself, especially On-jo, whom he is infatuated with.
Yoon Chan-young as Lee Cheong-san, a student of Class 2-5, he is On-jo's neighbor and childhood friend.
She has a high amount of knowledge relating to survival skills, due to her father's firefighter job.
Park Ji-hu as Nam On-jo, a student of Class 2-5, she is Cheong-san's neighbor and childhood friend.
With no food or water, and communication cut-off by the government, they must use equipment around the school to protect themselves in the midst of a battleground or they will become part of the infected.Ĭast and characters Main cast After a failed science experiment, a local high school is overrun with zombies, and the trapped students struggle to survive.