Meng Fanchen transmigrates to Shanghai during the War of Resistance Against Japan. Fortunately, he gains a special ability: anything he observes, he can calculate its relevant measurements with pinpoint accuracy, from the height of a wall and the length of a footprint to an opponent's swing speed, strike location, and angle in a fight. He also has a photographic memory and an exceptionally keen eye. From a person's clothing, the marks on their body, and their habits, he can deduce their general identity and what they have been doing recently.
With abilities like these, he is perfectly suited to become an agent. From the moment he arrives in Shanghai, his career as a resistance spy begins, taking him across Shanghai, the resistance base, county towns, and more...
Really bad,,,,