In 2025, history graduate student Lin Mo is caught in an explosion during a time-space experiment and falls into Shanghai in 1941. Amid the smoke-filled foreign concessions, he finds himself in the identity of “Jingzhe,” a Chinese Communist underground agent who has just been killed. Forced to assume this unfamiliar identity, he must go undercover in the lion's den of the Wang Jingwei regime's communications bureau.
The modern experimental wristband in his pocket has barely cooled when the Japanese Kempeitai begin closing in. He uses the history he's learned from books to anticipate danger and applies 2025 criminal-investigation methods to crack codes from the Republic era. But his “abnormal” behavior draws the relentless attention of Takahashi Hideki, who once mentored the original Jingzhe.
At a critical moment, he unexpectedly joins forces with Su Qingci, a Military Statistics Bureau agent bent on revenge. One is a “rookie transmigrator” who knows nothing about gunfights; the other, a cool, capable “rose of the Military Statistics Bureau.” From mutual suspicion to placing their lives in each other's hands, they navigate the conspiracy surrounding the Japanese “Amethyst Plan,” treading carefully over the fragments of history.
When his modern memories begin to diverge from the course of reality, and the blood of his comrades stains his sleeve, Lin Mo finally understands: what he carries is not a “script” for changing history, but the faith countless martyrs wrote with their lives. Amid the gunfire on the banks of the Huangpu River, he tightens his grip on Su Qingci's hand. This time, he will no longer stand by as a spectator to history. He will become a spy from the future who lights the way to dawn.
