Dressed as a Japanese spy, I used academic tricks to stir up the enemy camp. Li Mingyuan, a graduate student in the Department of History, suddenly died after finishing his thesis, and actually dressed as a Japanese spy major in Peking in 1937! As soon as I opened my eyes, I bumped into old K, the censor of the underground party, and he would be exposed and killed if he failed! Others judge others and use whips, but he prefers to use his professional knowledge to make things happen! Others relied on torture to extract confessions, but he opened an intelligence training class to teach information criticism, conducted impact factor KPI assessments, and set up a confession checking system. He turned the North China secret service into a pot of porridge! The Japanese spies stopped arresting underground gangsters. They turned over files every day and complained to each other in order to win the top spot. The torture room was immediately closed! On the surface, he is Doihara's highly regarded elite spy section chief, with ruthless methods and sophisticated tactics; secretly, he is a lone hero who protects his compatriots. He predicts the enemy's actions based on historical knowledge, joins forces with the underground party to pass on information, and plays tricks on the enemy! Using pen and ink as a sword, academics as a gun, watch a weak scholar work every step of the way in the heart of the Japanese, disrupting the enemy camp, guarding the mountains and rivers of Peking, and protecting the Chinese compatriots!