In the middle of the Anti-Japanese War, undercurrents surged in Jiangcheng controlled by Wang Puppet. [Shen Yan] disguised himself as a Japanese translator and lurked in the Japanese military's special high school. With his photographic memory and code-breaking ability, he searched for "mopping up" plans right under the eyes of the enemy. He endured the humiliation and faced the temptations of Matsui, the director of the special high school course, and always dealt with it calmly. The appearance of Suman, a traffic officer in the anti-Japanese base area, brought him hope for negotiation and also escalated the crisis. Under the strict control of the Japanese army, the two secretly passed on information and resolved the crisis of identity exposure several times. When the "mopping up" plan comes to light, Shen Yan must risk his life to send out the information, build a line of defense for the base area, and protect the millions of compatriots behind him.
