In 1941, Shanghai was undercurrent during the isolation period. Military agent "Qingshi" Chen Weian was in a dead end due to the rebellion of his superior "Xuanwu". The organization was severely damaged, and he himself was forced to lurk in No. 76, The Wang Puppet Agent Headquarters. Here, he met Wang's pseudo-female agent Shen Qinghe, whose background is a mystery. In the darkness, the two tested each other, becoming both enemies and friends. While lurking on thin ice, Chen Weian not only had to face heavy scrutiny from Japan's Special High School and colleagues No. 76, But he also had to find out the traitor who was hiding deeper and restart a secret intelligence line codenamed "Lighthouse." This is a lonely war fought in the heart of the enemy. Faith is the only light, and the darkness before dawn is the deepest.
