The Space-Time Defense War

High school student Chen Mingyuan scoffs at the War of Resistance Against Japan in history class, convinced that if he went back in time, he could change history. But an accident transmigrates him to Nanjing in 1937, where he witnesses the Japanese army’s brutality firsthand and fights alongside his comrades. He eventually loses both legs in the flames of war, but somehow survives. When he returns to the present, he finds that only five minutes have passed, yet the memories of blood and fire are seared into his mind.

But the rift in time and space has not closed. A mysterious photo album, a blood-red school badge, a mysterious woman from the future named Zhou Yutong... Chen Mingyuan gradually discovers that he is not the only one who has transmigrated. His classmate Lin Xiaopang and class monitor Li Yi are drawn into the past one after another, while the shadowy “Black Sun” organization is trying to alter history and destroy the future.

He must make a choice:

Stand by and let history repeat itself?

Or step forward, even if it costs him his life?

When gunfire rings out through time once more, he is no longer a bystander, but a guardian of history.