Gu Yan, a modern detective, accidentally traveled to Nanjing in 1936.
He originally did not belong to this era, but now that he is here, he must live. The criminal investigation experience in his previous life told him that the more chaotic the situation, the more calm he must be. He put on a uniform, entered the police station, and was pulled into the military command. On the surface, he was working for the National Government, but secretly, he got in touch with another group of people.
This is the story of a man who walks on a knife's edge. He has no system, no superpowers, only a mind that is so calm that it is almost indifferent, and a memory that should not belong to this era.
