The man surrenders to his wife's attack, and Yoo-bin shoots them both. She falls into him with Yoo-bin, who saved herself by pulling fabric over the infected wife's head. Joon-woo wakes up the stranger opens the door to check on his wife. As Yoo-bin tries to fight off the drug effects, the stranger binds their wrists and locks Yoo-bin in a bedroom with his infected wife. In the stranger's home, the pair accepts his food and water, and Joon-woo falls asleep from drugs in the water. As the pair is about to be overtaken, an older man emerges from the last suite on the floor and saves them. An infected man sees them and summons other infected. The pair gear up, rappel from their balconies, and fight their way to the 8th floor of Joon-woo's apartment, thinking no one lives on that floor. A group converges at her door, but Joon-woo distracts them by calling the unit adjacent to hers with the apartment complex's phone system. The infected hordes become agitated, and Yoo-bin accidentally knocks over a shelf. Joon-woo steals food, clothing, and walkie-talkies from his neighbour's unit and sends a walkie-talkie to Yoo-bin. Despite Joon-woo's distractions, the infected man reaches Yoo-bin's balcony but falls to his death when she wakes up and cuts off his hand. The table is pulled across her apartment and knocks her out. An infected firefighter climbs up a cable that Yoo-bin had tied to a table when she was attempting to set up the zip line. The two survivors set up a zip line to share food. Kim Yoo-bin, a survivor living in the apartment building opposite his, signals to him.

Joon-woo attempts suicide but manages to free himself when he sees a laser pointer's light moving around his apartment. He receives a voicemail from his family recording their last moments. As Joon-woo hallucinates about his parents and sister due to hunger and thirst, his phone network is restored momentarily. Joon-woo tricks him into falling off the balcony. Another infected man breaks into the apartment, knocking over the fridge and destroying the food inside. Though the emergency power stays on, Joon-woo gradually loses access to phone networks, the internet, and running water. His neighbourhood becomes overrun with infected. Joon-woo blocks his front door with the fridge and posts a rescue request on social media. He then receives messages from his parents telling him they are safe. Joon-woo pushes him back out and locks the door. The man begs to stay but succumbs to infection and attacks Joon-woo. When he opens the door to the hallway, a neighbour barges in. Oh Joon-woo is alone in his family's apartment when a mysterious disease that causes those infected to attack and eat uninfected people breaks out in the news and around him.

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