In 1943, in the Taihang Mountain base area, farmer Chen Fan accidentally picked up a secret letter from the Japanese army's "mopping up plan" and handed it to the village party secretary because he was illiterate. The underground party asked him to disguise himself as a "goodsman" and deliver the secret message to the military subdivision. On the way, Chen Fan met the Japanese "Qingxiang Team" and relied on the "selling secret code" to escape the search. He also helped the injured underground party liaison pass the news. In the end, Chen Fan successfully sent the secret message and the base was transferred in advance to avoid losses.
