In the middle of the Ming Dynasty, Dongchang and Jinyiwei were wrestling with each other, and the evil faction Youming Pavilion secretly emerged. Water transport became the economic lifeline of the imperial court and became the core battlefield of the game between all parties. The Shen family of the Jiangnan water transport family was brutally slaughtered due to the irrefutable evidence that Wei Bingyuan, the owner of the Dongchang plant, embezzled millions of coins and colluded with Japanese pirates for smuggling. The seven-year-old daughter Shen Yanqiu escaped by chance.
Twenty years later, Shen Yanqiu traveled alone in the south of the Yangtze River under the name "Hanjiang Blade". With his powerful Hanjiang swordsmanship, he specialized in killing corrupt officials involved in Cao Cao, and secretly traced the truth behind the family's destruction. Lu Huai, a member of the Fusi household in the North Town of Jinyiwei, was ordered to arrest the murderer. The two faced each other for the first time in the Caoyun Yamen archives, and each escaped with half of the old files. After several trials and battles, the two discovered that the target was the Netherworld Pavilion, so they put aside the confrontation between officials and bandits and formed a temporary alliance to investigate old cases together.
On the way to travel together in the world, the two were repeatedly intercepted and killed by the Nether Pavilion. At a critical moment, Lu Huai revealed his true identity as a descendant of the old Shen family. As clues were peeled off layer by layer, the Dongchang mafia and Japanese conspiracy behind the family massacre gradually emerged. Shen Yanqiu even discovered that his second uncle Shen Zhong was actually the key insider that year. When traveling north to the capital to collect evidence, his identity was revealed. The two were rounded up by the whole city and separated. Shen Yanqiu sneaked back to the ruins of the Shen family's old house alone, and found complete account books and ironclad evidence of his Japanese contacts.
In the end, Lu Huai gathered the anti-eunuch forces in the Jianghu and Chaotang to come back for help, and Shen Yanqiu teamed up with others to launch the final decisive battle against Youming Pavilion and Dongchang. The enemy was brought to justice, the Shen family was avenged, and Wei Bingyuan was convicted and sentenced to Ling Chi. Shen Yanqiu, who had avenged his great revenge, put aside his personal grudges and traveled side by side with Lu Huai, who had resigned, specializing in punishing evildoers.