Prima ballerina Dominika Egorova faces a bleak and uncertain future after she suffers an injury that ends her career. She soon turns to Sparrow School, a secret intelligence service that trains exceptional young people to use their minds and bodies as weapons. Egorova emerges as the most dangerous Sparrow after completing the sadistic training process. As she comes to terms with her new abilities, Dominika meets a CIA agent who tries to convince her that he is the only person she can trust.
This drama is set during the revolutionary time in Shanghai, based on a novel of the same name of Hai Fei. During the republican revolution, Chen Shen is a secret agent under Special Operations Executive Director Bi Zhongliang, among the agents called “sparrow” (similar to the program “zero” in Japan)