In 1937, Shanghai was in a dark and stormy environment, with various forces entangled here and undercurrents surging. Lin Mo, on the surface, is a shrewd manager of a foreign company, but in fact he is a core member of the "Panshi", an underground party organization of the Chinese Communist Party. He is lurking on this "isolated island", collecting intelligence and dealing with the enemy. Su Man, a military agent under the cover of a freelance writer, has extraordinary skills and thoughtful thinking, and shoulders the important task of slaying traitors and obtaining Japanese military secrets.
During an assassination operation against senior Japanese military officials, Lin Mo and Su Man met unexpectedly. The two had different goals, but were forced by the situation to temporarily join forces to test each other and be wary of each other. However, in the thrilling confrontations and cooperations, they got a glimpse of each other's beliefs and struggles hidden under the cold appearance. As a top-secret Japanese military plan codenamed "Black Sun" gradually surfaced, Shanghai and even the entire country were facing huge threats. In the face of national justice, Lin Mo and Su Man put aside their differences and began a dangerous alliance. Not only do they have to fight against the ruthless Japanese Special High School and the insidious Wang Puppet No. 76, But they also have to beware of possible traitors within the organization. In this "maze" full of lies and murderous intentions, their love grows in the gap between faith and reality, but may be crushed by the cruel reality at any time. When the illusion of the truth is peeled back layer by layer, can they successfully break through the end game and protect their homeland and loved ones in their hearts?
