The TV series "Eastern Battlefield" shows the story of the passionate resistance of the Chinese military and civilians against the people of other countries from 1931 to 1945. Compared with other war dramas, this drama interprets how the Eastern Battlefield affected the fate of the Western Battlefield from a new perspective. At the same time, the drama also covers major historical events of the Eastern Battlefield during World War II. In these war scenes, the confusing spy war is also depicted: the familiar Oriental female spy Kawashima Yoshiko and the little-known cryptographer Chi Buzhou all appear one by one, showing the little-known inside story of the spy war.