Sae-bom and Yi-hyun fall into a crisis due to the resident representative, Oh Ju-hyung, and other residents conspiring with Andrew. Tae-seok learns that Sae-bom is in danger and tries to get her out. And Yi-hyun, who still hasn’t told Sae-bom about being infected, tries to protect her in any way he can. However, they end up face to face with a mob of the infected.