In the winter of 1941, Shanghai was isolated. The Wang Puppet Government's Secret Service Committee (Super High School Section) is intertwined with the three forces of the military command and the underground party of the Communist Party of China, and the situation is turbulent. Gu Yuanshan, an underground member of the Chinese Communist Party code-named "Listener", lurks in the core of Wang's puppet spy agency "No. 76". In the brutal operation to purge the insider, he must not only conceal his identity, but also send out a top-secret intelligence about the situation in southern Anhui.
