Qin Xuemei, the daughter of a wealthy family in Shanghai, met and fell in love with Lu Zhenhua, a girl who had returned from studying abroad, because of family grudges, but was forced to separate due to war and conspiracy. Qin Xuemei accidentally discovered that her mother's sister Lin Dongmei might still be alive and was involved in a secret intelligence network "Dongmei" spanning China and Japan.
In order to uncover the mystery of her mother's life experience and prevent the atrocities of the Japanese army, Qin Xuemei traveled from Shanghai to Hong Kong, from Chongqing to Tokyo, and worked in enemy camps with multiple identities such as piano teacher and field doctor.
