Yes, there was a novel called "Rebirth from the Spy Battle of Crossing the Capital". The male protagonist was a university student from the history department from the future. He had no family in Chongqing, the capital of the Republic of China during the Anti-Japanese War. However, he joined the military commander's Linli special training class by chance and fought with various forces in the command center of the world's anti-fascist eastern battlefield. At the same time, he also experienced national hatred, resentment, love and hatred. In the extraordinary years, he reappeared the legendary life of growing from an unknown small agent to the king of agents. I hope you like this fairy's recommendation. Muah ~😗