Codename Zero, the lurker Bai Yuan. He is the ace instructor of the enemy's Military Intelligence Department and our highest-level top-secret silent agent.
When the entire Military Intelligence Agency went out to hunt down the "Shadow" and everyone was in danger, no one knew that the top commander responsible for formulating the pursuit plan was none other than the Shadow himself. Every student he taught personally became a pawn in his game.
The day when the identity is exposed, when the ace returns. The former instructor turned around, held his gun, and used the enemy's entire intelligence network to sacrifice the flag - he had been setting up this game for ten years.
