In 1930, there was a turbulent undercurrent on the beach in Shanghai. Before the bloody dawn, a spy war concerning the survival of the country and the country quietly unfolded——
Jiang Xinyue, who has returned from studying abroad, appears to be the apple of Songhu Security Commander Jiang Shihong's eye, but is actually an underground member of the Chinese Communist Party. In order to destroy her father's conspiracy, she pretended to be a couple with her former classmate Zhou Shiwen and lurked in Shanghai where the powerful gathered.
