The group clears a path to Cheong-san using sound to draw away zombies, but a new type of threat surfaces. Nam So-ju breaks out of the quarantine camp.
Quest roles:
Ahn Seung-gyun(Oh Joon-yeong), Jo Dal-hwan(Jo Dal-ho), Woo Ji-hyeon(Kim U-sin), Lee Eun-saem(Park Mi-jin), Bae Hae-Sun(Park Eun-hee), Ahn Ji-ho(Kim Cheol-su), Ha Seung-Ri(Jang Ha-ri), Son Sang-Yeon(Jang Wu-jin), Kim Bo-yoon(Seo Hyo-ryung), Jin Ho-eun(Jung Min-jae), Lim Jae-hyeok(Yang Dae-su), Kim Jin-young(Kim Ji-min), Oh Hye-soo(Min Eun-ji), Yang Han-yeol(Yoo Joon-sung), Ahn Se Bin(Se-bin), Park Jae-cheol(Jeon Ho-chul)