During a counterintelligence exercise, code simulating a hacker intrusion suddenly turns into a real attack program.
National secrets are at risk of being leaked, and Li Heng, one of the exercise participants, becomes the prime suspect.
To prove his innocence, he has no choice but to team up with his opponent in the exercise, psychological profiler Meng Qing.
Their investigation uncovers an overseas organization codenamed “Shadow,” which has been infiltrating the country for some time.
The exercise malfunction turns out to be connected to the accidental death of Li Heng’s mentor three years ago.
At the crucial moment, his partner Qian Jun suddenly points a gun at Li Heng. “You’re Shadow.”
