For several years, humanity has been living in the midst of the COVID-19 pandemic, where suddenly some people begin to experience intense thirst, transform into zombie-like creatures, and attack others. Yoon Se-bom, a combatant from the Counter-Terrorism Department, encounters one of these infected individuals and, after being scratched by him, is taken to a crisis center to combat the new virus. However, her examination reveals that she is not infected, and Se-bom takes advantage of the situation by entering into a fake marriage with her best friend, the principled police officer Jung Yi-hyun, in order to obtain an apartment in a n...