Zhang Zhe

In 1953 the Korean War is entering the final stage. The People's Volunteer Army of China has launched its last major battle in Kumsong. In order to arrive on time and deliver enough ammo to the Kumsong front line, the soldiers have to defend themselves against the never ending bombardments of enemy bombers and race against time to repair the last bridge, all while facing supply shortages and with inferior equipment.

Set against the backdrop of the Chinese Civil War, the film tells the story of a secret agent named Lin Xi. Lin Xi, a covert operative working for the Communist side, is tasked with rescuing a fellow spy codenamed "Green Snake" who has been captured by the enemy. His mission is to help "Green Snake" deliver crucial defense plans of Jinzhou city to the People's Liberation Army outside the city, thereby supporting the assault on Jinzhou.

Wen Yifan, by chance, ends up living with her high school classmate Sang Yan, whom she once rejected. They keep their distance until Wen Yifan learns from Sang Yan that she sleepwalks, intertwining their lives once more.