Top Secret Hidden Line: 1940

Historical researcher Lin Hao accidentally triggered a dusty "space-time beacon" while sorting out top-secret files, and his consciousness was drawn into the whirlpool of Shanghai in 1940. When he woke up, he had become the "Grey Crow", a member of the Shanghai Station Action Team of the Military Command (actually a deep lurker of our party), living in a devil's cave, dancing on the tip of a knife. Also awakening with him was a silent and broken "strategic intelligence assistance system"-"Firefly". It has no shopping mall, no weapons, only cold data analysis and energy-draining early warnings. In the front, there is the pressing step by step agent No. 76, And in the back there is the strife and suspicion within the military command. Surrounded by top-secret information that needs to be conveyed and comrades that need to be protected. Li Yunlong's spirit of sword-fighting lies in his tactical wisdom and fearless courage in desperate situations; the treacherous nature of the spy war lies in the psychological game and identity puzzle like a secret room. Lin Hao must use the overall historical perspective from the future and the faint light of the "firefly" to make precise moves in the darkest moment. He knows the direction of history, but he also knows the huge waves that every small change may bring. This is not a game, this is a tribute to carrying forward with a heavy burden. Can he protect himself while protecting the nameless fires destined to be lost in history?