In the 19th year of Wanli in the Ming Dynasty, Jinyi Weishi Shiyong, Zheng Shiyuan, and Cheng Yixue were investigating cases in the capital when they unexpectedly received a secret report from Japan.The person who sent the secret message was a patriot who had been living overseas for many years. He warned in the secret message that Japan was preparing to launch a war to invade the Ming Dynasty.The Ming Dynasty immediately sent Shi Shiyong, Zheng Shiyuan, and Cheng Yixue to Japan to collect accurate intelligence. With the assistance of patriotic businessmen and overseas compatriots, the three went through hardships and dangers, brought back a large amount of precious military intelligence, and successfully rescuedPatriots.