A Game of Two-Sided Chess

During an anti-espionage exercise, code simulating a hacker attack suddenly turns into a real attack program.

With state secrets at risk of being leaked, Li Heng, one of the exercise participants, becomes the prime suspect.

To prove his innocence, he has no choice but to team up with Meng Qing, the exercise's opponent and a psychological profiler.

Their investigation leads them to discover that an overseas organization codenamed "Shadow" has already infiltrated the country.

And 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."