This is the story of a rookie researcher who, under someone's guidance, is forced to abandon a leisurely life and grimly face zombies and various assassins, living on the edge with constant danger, ultimately becoming a senior researcher revered by all and recorded in human history.
Background: Two hundred years ago, the Comet Virus ravaged Earth, infecting the vast majority of humanity and turning them into zombies. The remaining humans took refuge in an underground city called Shire. Based on research into the Comet Virus, the military developed the X-Virus suitable for humans, and the Special Task Force became a formidable combat unit after receiving the X-Virus.