This seemingly peaceful modern world has countless dangerous undercurrents surging in the dark. International criminal organizations are raging and terrorist attacks occur frequently, and behind them is a mysterious force controlling them. As a top agent, Lin Xiao, codenamed "Shadow", belongs to a mysterious international agent organization. He possesses unique skills, is proficient in various weapons and fighting techniques, is calm-minded, and is good at finding hope in desperate situations.
Lin Xiao was involved in a huge conspiracy related to global security. What he has to face is not only cruel and cunning enemies, but also betrayal and suspicion within the organization. From the streets of bustling cities to war-torn foreign countries; from mysterious underground trading venues to heavily guarded terrorist organization bases, Lin Xiao went through obstacles all the way to pursue the truth of the conspiracy. In the process, he met the beautiful and intelligent female agent Su Yao, as well as a group of like-minded partners. They fought side by side to fight against the forces of darkness. In the baptism of blood and fire, they composed a legendary war song of agents.
