Modern young man Lin Yu traveled through Shanghai in the Republic of China and awakened the espionage system, but accidentally fell into the military command and fell into a murderous situation. Relying on his modern thinking and systematic abilities, he dealt with the Japanese army, the Wang puppets and the Allied forces to the extreme, and accidentally discovered the shocking conspiracy of the Japanese mysterious organization "Sakura". When his comrades died tragically and trust collapsed, Lin Yu broke into Longtan Tiger's Den alone and discovered that the leader of "Sakura" was actually a strange girl with supernatural power. In order to prevent the "coming from the other side" that could destroy everything, he united with the underground party and used the resources of the US military to fight back in the face of poison gas warfare, economic strangulation and erosion of consciousness. This is a desperate battle across dimensions. When a faint blue beam of light rises from the Huangpu River, Lin Yu's bullet must penetrate the barrier between the two worlds.
