In 2026, when Jin Huaiyan, an old man in his nineties, was on his deathbed, he was full of regrets that he could not protect his father Jin Yanzhi, an overseas economic official who sacrificed his life for the revolution, and his mother Su Wanqing, a teacher from a large Jiangnan family who became ill due to overwork. His strong obsession led him to be reborn and return to Shanghai in 1945, at the age of 20. At that time, the Anti-Japanese War was coming to an end and the crisis was looming. He concealed the secret of his rebirth and relied on his memory to gain the trust of his parents. Side by side with his elegant and decisive father and his gentle and tough mother, he used his father's official connections and the power of his mother's family to detect traitors, pass on information, and protect his loved ones in the undercurrents of Shanghai. The three people's perspectives are intertwined, from hiding to liberation to the construction of New China. They go to the mission with their original intentions, rewrite their regrets, fulfill their responsibilities for their family and country, and finally achieve perfection.
