1995: Starting as a Criminal Investigation Expert

The year is 1995. Surveillance cameras are not yet widespread, DNA testing remains an advanced and rarely used technique, and fingerprint matching relies entirely on the naked eye. Criminal investigation still trusts the seasoned intuition of "master detectives" who depend on nothing more than a pair of footprints and a pack of cigarettes. This is the year Li Shu, a police academy graduate, joins the Nanjiang City Bureau's Technical Squad and activates the Criminal Investigation Expert System. From this moment on, everything changes. When there are no eyewitnesses, physical evidence becomes the witness. When there is a zero-confession case, forensic traces serve as the confession. For those who think wiping away fingerprints destroys the trail, the truth remains: the act of erasing leaves them behind at the scene. Experience can deceive, and suspects can recant their testimonies, but physical evidence never lies. Li Shu has a single ambition: before his time, solving cases was an art; after him, solving cases is a science. And he is the one who sets the standard for that science.