The protagonist is a theoretical physicist who traveled back in time to the early days of the Anti-Japanese War. He has no military experience, no fighting skills, and no "espionage qualities" in the traditional sense. All his weapons are mathematical intuition and top-notch physics thinking in his brain. He found that the Japanese army's intelligence network, logistics lines, firepower configuration and even cryptography systems had a large number of physical loopholes based on "empiricism". He doesn't need to steal intelligence. He only needs to get a few battle reports and weather data to calculate where the enemy's weak points are and where the next artillery shell should be fired. He packaged himself as a "crazy scholar", but in fact he was a "walking top think tank" secretly competed for by the top leaders of the Kuomintang and the Communist Party.
