In Songhu in 1937, Wei Yaoxuan, chief of the intelligence section, was chasing the Japanese spy "Night Owl", but accidentally contacted the mysterious radio station and connected with the consciousness of Gao Nuoqing, a national security cryptography expert a hundred years later. Living in two time and space, they must disguise themselves together, uncover a shocking conspiracy that spans the century in the intricate spy shadows and misplaced time and space, and protect the same broken mountains and rivers in the smoke of war.
