Shanghai, 1938

Gu Changjun, a wealthy young man who has returned from studying abroad, loses both his parents after they are persecuted by the Japanese and his own uncle. To avenge them, the protagonist has no choice but to swallow his pride and pretend to submit to the Japanese. To keep him under tighter control, the Japanese arrange a marriage for him. His bride, Ding Ning, is a Japanese spy, and one of a pair of twin sisters. After their tangled relationships unfold, a love triangle marked by amnesia takes shape.

Using his status as a Japanese son-in-law and president of the Shanghai Chamber of Commerce, Gu Changjun passes intelligence to the Communist Party, blows up military depots, and assassinates Inoue... After spending a long time together, the couple weather misunderstandings and painful love. At last, they stand united with the underground Party, defeat their enemies, and head for the revolutionary base to welcome the founding of New China.