Hyun, a loner high school student who lost his entire family in a terrible accident, is forced to leave his home and has to face a new reality where monsters are trying to wipe out all of humanity. Now he must fight against all odds to try and race against the clock to save what is left of the human race before it's too late.
Cast:Song Kang , Lee Jin-Wook , Lee Si-young , Lee Do-hyun , Park Gyuyoung , Kim Guk-Hee , Woo Jung-Kook , Su-Hyung Im , Lee Joon-Woo , Kim Hee-Jung , Matthew Yang King , Victoria Grace , Harrison Xu , Tohoru Masamune , Michelle Mao , Remington Hoffman , Keong Sim , Ji-young Yoo
Cha Hyun-su moves into the run-down Green Home by himself. Not long after, he witnesses a disturbing sight in his neighbor's apartment.
As a state of emergency is declared, the residents tie up Pyeon Sang-wook for being bitten. Hyun-su is unable to ignore a family in distress.
An unexpected savior protects the children from harm as Hyun-su, together with Yoon Ji-su and Jung Jae-heon, tries to bring them to safety.
Critical information about the monsters is made public. When residents are split on what to do with Hyun-su, Lee Eun-hyeok suggests they hold a vote.
Tasked to carry out dangerous missions, Hyun-su heads back to retrieve Han Du-sik. Sang-wook stops at nothing to finish what he started.
As Seon-yeong confronts the greatest monster in her life. Leaving the building, Seo Yi-kyung heads to her fiance's office in search of answers.
Hyun-su saves the others from a deadly attack. Running out of necessities, Eun-hyeok announces a plan to venture outside for resources.
Having little options in her state of being, Ji-su agrees to take a big risk. Yi-kyung returns to Green Home just in time.
When a team of outlaws takes over the building, the residents are shown how humans can be even more barbaric than the monsters.
A military leaflet promises a route to safety, but the group is reluctant to trust it. Hyun-su is exposed to a new perspective on his condition.