Zhang Jin was affiliated with the Rebellion Analysis Department under the Intelligence Command Section of the Privy Council.
This was a rather obscure department. Simply put, it was responsible for gathering a substantial amount of personal intelligence on military leaders who posed a risk and then analyzing said information to assess their loyalty and the potential points at which they might defect.
Or, as the department head would say, "to see through the surface disguise and into the hearts of others."
To analyze this intelligence, psychology was naturally an essential foundation, and interrogation studies were also of paramount importance. The majority of the department's staff had been transferred in from the Military Police Corps, but Zhang Jin had previously worked in the criminal investigation section of a local public security unit and was brought in through a special talent recruitment channel, also known as "exceptional admission."