The Clerk They Mocked Was a Legendary Spy

Once the only agent in the CIA known by the code name Zero, a man now works quietly as a school social worker, where colleagues mock him, ignore his work, and treat him as a nobody. Behind his ordinary desk and unassuming manner lies a past that nobody around him suspects. As the people who belittled him keep pushing, he must decide how long to keep playing the fool before his real skills come out.