In the Wanli year of the Ming Dynasty, Japanese riots resumed again. Patriotic compatriots overseas unexpectedly learned that Japan was planning to invade Ming Dynasty via Korea and sent a signal to Ming Dynasty. Mistakes also broke out in the capital here. Shi Shiyong, Zheng Shiyuan and Cheng Yixue of the Royal Guards were forced to jointly investigate the case because of the gathering of clues to the case, and traced back to the source of the chaos to the Japanese pirates!