1941, Shanghai.
He's not a soldier, he's not an agent, he's not a member of any profession.
He's just an accountant.
Go to work and get off work every day, do abacus calculation, and keep accounts.
No one noticed him, no one remembered him, no one found him useful.
But the Japanese military train schedule, the puppet government's financial loopholes, and the batch of penicillin needed by the military commander——
All the data rolled over one by one on the abacus beads under his hand.