Shen Lang, on the surface, is a romantic young man traveling among the upper classes of various countries, but in fact, he is the ace agent of the mysterious organization "Long Yuan". During a mission, he shared top-secret information related to national security with his most trusted confidante - the gentle and pleasant university teacher Su Qing. Unexpectedly, this trust was exchanged for fatal betrayal. Su Qing turned out to be the spy "Nightingale" who had been lurking for many years, pushing Shen Lang into a desperate situation. After escaping from death, Shen Lang fully awakened. With the "Long Yuan System" (Golden Finger) given by the mysterious organization, he can accurately calculate battlefield data, analyze the enemy's psychology, and predict the trajectory of actions. He will use this heaven-defying ability to transform into a ghost walking on the tip of a knife, and launch a thrilling battle of revenge and redemption against enemies who betray their faith and trample their loyalty.
