The infected multiply in droves. Scrambling for their lives, Nam On-jo and Lee Cheong-san find safety with others inside a classroom — but not for long.
Quest roles:
Ahn Seung-gyun(Oh Joon-yeong), Jung Yi-seo(Kim Hyeon-ju), Lee Sang-hee(Park Sun-hwa), Yoon Kyung-Ho(Jung Yong-nam), Woo Ji-hyeon(Kim U-sin), Lee Eun-saem(Park Mi-jin), Ahn Ji-ho(Kim Cheol-su), Ha Seung-Ri(Jang Ha-ri), Son Sang-Yeon(Jang Wu-jin), Dong Hyun-bae(Park Young-hwan), Kim Bo-yoon(Seo Hyo-ryung), Jin Ho-eun(Jung Min-jae), Lim Jae-hyeok(Yang Dae-su), Ham Seong-min(Han Gyeong-su), Kim Ju-a(Yoon I-sak), Kim Jin-young(Kim Ji-min), Oh Hye-soo(Min Eun-ji), Lee Chae-eun(Park Hee-su), Uhm Hyo-sup(Principal), Yang Han-yeol(Yoo Joon-sung), Yoon Byung-hee(Kang Jin-gu), Chae Dong-hyun(Archery Coach), Lee Min-goo(Lee Jin-soo), Kim Jeong-yeon(Kim Min-ji)