In the autumn of 1941, Lu Mingyuan's "tailor" was assassinated in the French Concession. Before his death, he left a secret code that only Lu Mingyuan could decipher - the longitude and weft of a piece of cloth. Lu Mingyuan rushed to the tailor shop and found that the body had been moved away by the patrol room, but the tailor left a number in the middle of the cloth. Before he had time to explain, the people from the extra-high school class arrived.
