Jeon Bae-soo as a masked man who saves Joon-woo and Yoo-bin but wants to feed them to his zombified wife. Lee Hyun-wook as Lee Sang-chul, the infected tenant whom Joon-woo lets in. Oh Hye-won as the policewoman who is turned into a zombie by the infected.

The Forgotten Villains are a group of supervillains in the DC Comics universe. They are enemies of Superman and the Forgotten Heroes and attempted to conquer the universe but were defeated by their rivals. The three main leaders of the group were the Enchantress, Kraklow, and Yggardis.