As a state secret investigator, forensic doctor Chen Xu accidentally discovered a biological experiment accident that happened twenty years ago while investigating the case of "New Youth" in Hongtiaoyuan. This case happened to be related to the experimental accident that year. As Chen Xu continued to investigate, he found that all the investigators responsible for this case were inextricably linked to the accident that year. At the same time, in the "New Youth" case, the scientific researchers who disappeared unexpectedly in the early days returned safely one by one without any warning. But after getting along for a period of time, Chen Xu and others discovered that almost all of the people who came back were "fake", but the real ones were helping this group of people cover up the truth behind the scenes...
Intent: The concealed facts are only concealed and never disappear.