In the late period of the Anti-Japanese War, when the enemy-occupied areas were turbulent, {Shen Yan} lurked as a translator for the Japanese military intelligence department. With his photographic memory and code-breaking ability, he secretly collected information on the Japanese military's "mopping up plan". The base traffic officer {Su Wan} met him as the proprietress of a grocery store. Under the close supervision of the Japanese section chief {Matsui Yuichi}, the two encountered dangers several times. Matsui Yui pressed Shen Yan's suspicion step by step, and tests and counter-tests were intertwined. Shen Yan endured the humiliation, and Su Wan cooperated tacitly, and finally sent out key information to help smash the base area. But the intelligence transmission exposed traces, and Shen Yan's identity was at stake. In the end, with the help of Su Wan, who sacrificed his life, he had a thrilling escape from the Japanese raid.
