Young scholar Su Xiao accidentally triggered a dusty "time ripple" at the former Soviet Consulate site in Longsha Park, establishing a connection across time and space with Sergey, the Soviet consular secretary in 1935. From the shock of looking at each other in the mirror to the conspiracy of life and death, the two men work together to guard historical secrets related to the fate of countless people in the dual time and space of war and peace.
However, every intervention in the past made Su Xiao pay the price of "memory overwriting". When the "interferers" chasing the truth surfaced, and when the law of time issued an ultimatum, Su Xiao chose to use all her memories as fuel to issue the most determined "declaration of existence" to the long river of history - just for the figure who carved a way out for her in the wind and snow.
This is a race against time, and it is also a proof of love and existence. Even if I forget your face, I will still protect our common vows at the end of time.
