Ten years ago, childhood sweethearts were separated due to the war; now the singer Yan Qingyi is living her life singing at Paramount; the officer Sheng Jingchuan returns to Shanghai in the name of receiving supplies; the two meet again in the dance hall, pretending not to know each other; Sheng Jingchuan's true identity is a hidden underground party member, and he needs to be informed by the Japanese special forces Yan Qingyi accidentally collected a pocket watch engraved with a code, which was a relic of his father; the pocket watch became the focus of many parties, holding the secret hiding place; the gang leader Zhao Si worked for the Japanese and repeatedly hunted down Yan Qingyi; Sheng Jingchuan secretly protection, and resolved the crisis many times; the relationship between the two slowly warmed up through trials and misunderstandings; Yan Qingyi gradually learned about Sheng Jingchuan's true mission, and her inner conflicts were intertwined; the Japanese secret service set up a bureau to frame Sheng Jingchuan, and Yan Qingyi stepped forward to testify; a traitor appeared within the organization, and Sheng Jingchuan committed suicide His identity was exposed; he was forced to evacuate Shanghai, and Yan Qingyi decided to follow, but was surrounded and shot at the dock; Sheng Jingchuan led her to break out but lost contact; a few years later, Shanghai was liberated, the two met by chance on the street, and their respective identities had changed; they finally chose to give up the past honor and disgrace and stay together in an ordinary life
