In Shanghai in 2024, takeaway deliveryman Lin Yuan was involved in a car accident while delivering food. When he woke up, he was in a Shanghai alley in 1943 under the rule of the Japanese and puppets. A "historical perturbation system" emerged in his mind, giving him special abilities such as language proficiency and intelligence analysis - but each use accelerated the backlash of history.
With street survival experience and system assistance, Lin Yuan struggled to survive under patrol questioning and Agent 76 surveillance. Lao Zhou, the owner of the cigarette paper shop, taught him the philosophy of saving life in troubled times. Shen Ruolan, a surgeon at Renji Hospital, discovered his secret due to a bullet scratch, and the fate of the two became intertwined. A street assassination involved him in the anti-Japanese intelligence network. The liaison officer Mr. Cheng took a fancy to his "fresh face" advantage and invited him to become a non-staff intelligence agent.
Lin Yuan dealt with various forces: a battle of wits and courage with traitor No. 76 Zhao Jinlong, a cat-and-mouse psychological game with Masao Sato, the head of the Japanese Military Police Special High School Course, and a friendship that spanned the enemy and the enemy with Jiro Ono, a Japanese soldier who loved Li Bai's poems. From a passer-by who just wanted to find a way home, to gradually being entangled in the people and things of this era - Lao Zhou's sacrifice made him feel real pain for the first time, and Shen Ruolan's love gave him a reason to stay.
When Lin Yuan discovered that time travel was not an accident, but was carefully arranged by an organization, he faced the ultimate choice: return to modern life in 2024, or stay in this 1943 full of smoke and blood? He closed the system interface and chose to become a part of history. In August 1945, when news of Japan's surrender came, Lin Yuan stood at the entrance of the alley and walked towards Shen Ruolan who was waiting for him with a smile.
