In 1939, after the fall of Songhu, the Japanese army, the Wang puppets, the military command, and the underground party secretly competed on the isolated island and the occupied area. A top-secret intelligence list involving dozens of latent lines suddenly "broken" during the transmission, and the upper and lower lines lost contact at the same time, causing the entire intelligence network to be on the verge of collapse. Lu Xiao, a modern special forces soldier, died accidentally during an overseas operation. His soul transformed into a military traffic officer who had just been tortured by the Japanese army. When he woke up, he was in the Japanese and puppet prison in Shanghai, with only half a secret message and a combat instinct that did not belong to this era. In order to survive, and to make up for the "fault" that could kill countless anti-Japanese personnel, he had to disguise the identity of the original owner while rebuilding the broken communication chain in enemy-occupied areas. But as the investigation deepened, he discovered that the fault was not an accident, but someone deliberately cut off the intelligence bloodline and used the Japanese army to clean the entire front.
