Tell the story of two left behind children with vastly different personalities, facing the cruel truth of life together, and completing their own growth test before the topic of life and death.

In the 1960s, Guo Xiaolu and Su Lingfang met for the first time. They should have grown up together because of an accident. The never-arriving letter allowed the two to embark on a different life trajectory and opened the fate of a lifetime. The reunion after a long absence coincided with the prosperity of the two. Ding Mengmeng (Li Tingting), Wang Xiaomo (Wang Xiaokun) and Wang Qingwei (Xu Weihao) were also accompanied by them. As the years passed, the fate of a generation was ups and downs in the torrent of the times. After Guo Xiaolu reunited with Su Lingfang after life and death, they made an unexpected choice.

Aspiring young detective Xiang Li Xiqi takes on the case of a stolen research paper at school. With help from his friend Ren Shirou, he investigates a web of clues and classmates’ suspicious actions. As doubts rise, Xiang must rely on his sharp instincts to uncover the truth and prove himself.

Set in the early years of the Xinhai Revolution, the film tells the story of a group of revolutionaries who, in their pursuit of awakening the masses and advancing China’s democratic movement, risk everything—including their lives. Through sacrifice, courage, and unyielding conviction, they write a stirring chapter of heroism in the history of China's democratic revolution.