During a counterintelligence exercise, code that simulated hacking suddenly turned into a real attack program.
National secrets were exposed, and Li Heng, who participated in the exercise, became the first suspect.
In order to prove his innocence, he had to join forces with his training opponent and psychological profiler Meng Qing.
The two conducted an in-depth investigation and discovered that an overseas organization code-named "Shadow" had already infiltrated.
The failure of the exercise was actually related to the accidental death of instructor Li Heng three years ago.
At the critical moment, his partner Qian Jun suddenly pointed his gun at Li Heng: "You are the shadow."
