A popular vlogger swears he has encountered a zombie, which goes on to attack more people. Skeptical, the investigators mobilize to uncover the truth.

Na plants more seeds of suspicion in Kwon Joo's mind, telling her of Kang Woo's past and bouts of amnesia. Eun Soo is threatened by an ex-boyfriend.

Amid suspicions that Eun Soo may have played a part in a stabbing, the team arrests its suspects. But they notice evidence of yet another accomplice.