Saebom, a Sergeant of the Special Forces, and Ihyeon, a Detective Sergeant of Saeyang Police Station, are high school friends who enter into a marriage of convenience so that they can qualify to buy an apartment together, while a mysterious and seemingly contagious virus tears through their city of Saeyang. Saebom and Ihyeon move into their dream home only to find that the new virus that turns people violent and thirsty for blood has come knocking at their door.
