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An unprecedentedly powerful virus sweeps across the entire country. The consequences of a suspicious incident are that everyone on the scene dies after a two-day incubation period, with a mortality rate of 100%! To address this enigmatic virus, the "Special Infectious Disease Control Team" is formed to find a solution and investigate the underlying truth. Team member Lee Myeong-yeon (played by Yeon Gi-joon) becomes increasingly convinced that the virus incident is far more complex than initially imagined during the investigation. Meanwhile, they discover that there was a survivor among those present at the scene. To prevent more people from being infected, Myeong-yeon continues to track down the survivor, Kim In-jeol (played by Kim Hyun-woo). Thus, a cat-and-mouse game begins, and Myeong-yeon seems to have been infected with the virus during the tracking process. As the environment becomes increasingly dire, what is the ultimate truth...