In Shanghai in 1938, the life of wealthy businessman {Shen Ruowei} collapsed when the family business was infiltrated by the Japanese army. When danger comes, she always escapes by chance due to the "heart palpitation warning", but she is also accidentally involved in the whirlpool of spy wars. She met Lu Shiyan, a military agent who appeared to be romantic on the surface, but she didn't know his underground party identity, nor did she know that he had a hidden mission and struggle towards her. Being behind in the family, Shen Ruowei relies on his early warning ability to help Lu Shiyan pass on information. The two protect each other amidst the neon lights and smoke of the French Concession, but they also experience misunderstandings and separation due to their mission in troubled times. When the Japanese spy chief Sato presses harder, they must not only fight against foreign enemies, but also resist the inner fear of "implicating each other". In the end, Shen Ruowei transforms from a charming lady into a patriot, and joins forces with Lu Shiyan to smash the Japanese army's conspiracy, making love more and more firm in the righteousness of the family.
