That year, DNA technology was not yet widespread, surveillance cameras were still a science fiction concept, and fingerprint comparison relied entirely on magnifying glasses. That year was a celebration for criminals and a nightmare for criminal investigators. Gu Chen, newly joined the police force, envisioned a "future archive" in his mind. Looking at the crime scenes that would become unsolved cases of the century, Gu Chen silently put on his white gloves. "I know this murderer. Thirty years later, he's on page 50 of this case file." From a lowly patrol officer to a specially appointed expert by the Ministry of Public Security, Gu Chen vowed: In this life, he would ensure that all evil has its place!