Zhang Mianheng, a elite special forces soldier codenamed "Dagger," unexpectedly travels back to Nanjing in 1936 during a mission… Capturing Japanese spies… eliminating traitors… gathering intelligence… transporting strategic materials? The Military Intelligence Bureau considers him their most important agent, the Communist Party lists him as a top-level intelligence officer, while the Special Higher Police see him as a major threat, vowing to expose and eliminate him… Main character: Zhang Mianheng