In the middle of Qianlong's reign, the Daqing River flooded, and Shengfang County Magistrate Li Mancang took the opportunity to commit corruption, which made the disaster worse. In order to check the people's sentiments, Emperor Qianlong took the princess and his personal guards to tour Shengfang, known as "Shengshui Hefang" in Sanzhou (now Bazhou). Unexpectedly, the news was intercepted by the Tiandihui, an anti-Qing and restoration organization, and the Dongyi Japanese pirates who hated the Qing government's policy of extermination. A shocking assassination plot kicked off... Qianlong and others stayed at Shengfang Hexiangzhai Inn that night, and were assassinated by Xue Shuying's senior brother, Jiang Shicheng, the incense master of the Tiandihui. Xue Shuying thought of the old relationship and released Jiang Shicheng in order to influence him. On the way back, Xue Shuying got the account book of Li Mancang, the magistrate of Wen'an County, from the "righteous thief" Lone Ranger, and learned that Yamaguchi Taro brought 300 samurai to assassinate Qianlong. Qianlong ignored Xue Shuying's advice and insisted on going to the yamen to severely punish Li Mancang. Unknown, Li Mancang has colluded with the Japanese pirates, spread a big net, waiting for Qianlong and others to surrender. Zuo Kuang, the son of the former Minister of Rites Zuo Shilang, avenged his father and also followed the trail to assassinate Qianlong, but was captured. But he also learned from Qianlong that his father was framed and killed by treacherous officials because of his resistance to the Japanese. Zuo Kuang fell into confusion and met the Lone Ranger by accident. Under the persuasion of the Lone Ranger, he became Qianlong's guard. Because of natural disasters and man-made disasters, some victims from Henan and Shandong fled to Shengfang. Wu Daochun, a famous doctor in Shengfang, used his ancestral secret recipe to rescue many victims for free. In order to get the prescription, Li Mancang forcibly sealed Wu Daochun's medicine shop with a false crime, and hired a killer to kill the famous doctor to grab the prescription. The murderer happened to be met by Xue Shuying when he was committing the crime. Xue Shuying was attacked by the killer to save the famous doctor. Wu Chunzi, the daughter of Wu Daochun, was grateful to Xue Shuying, and the two fell in love. In order to strengthen his power to assassinate Emperor Qianlong, Yamaguchi Taro wanted to form an alliance with the Tiandihui, but was sternly rejected by Jiang Shicheng. Therefore, Yamaguchi Taro bribed Deputy Xiangzhu Yang with money and generous salary. Deputy Xiangzhu Yang guided Japanese samurai to kill Jiang Shicheng's wife and tried to frame Xue Shuying. Unexpectedly, Xue Shuying helped Jiang Shicheng recognize the true face of Deputy Xiangzhu Yang. In order to save himself, Deputy Xiangzhu Yang slandered Jiang Shicheng as a sinner who betrayed the Tiandihui and issued an order that "anyone who meets Jiang Shicheng should be killed without mercy." Qianlong went to the yamen to punish Li Mancang, and was ambushed by Yamaguchi Taro. Fortunately, Xue Shuying took precautions in advance, which allowed Qianlong and others to escape. The assassination of Qianlong failed, and Yamaguchi Taro was furious. He sent his daughter Yamaguchi Keiko, Banmoto Ryuichi and other samurai to search the city for Qianlong. Under the deception of Deputy Xiangzhu Yang, the people of the Tiandihui also cooperated with the action. A large-scale siege began... Qianlong followed Xue Shuying's advice, hid in the hotel, and stopped going out. Ban Ben Longyi and others learned the news and led people to come. The proprietress, who had long faded out of the martial arts world, learned the situation and risked her life to cover Qianlong's escape, and died in battle. Faced with the grim situation, Wu Chunzi took the initiative to ask for help from Bazhou. At the same time, Xue Shuying asked his former opponent Xiao Yiming, who had been in seclusion here, to come back and lend a hand, but was rejected. Xue Shuying's delay in returning made the princess very worried. Qianlong and others fled to an abandoned temple in a panic, and Yamaguchi Keiko and others followed closely. At the critical moment, Wu Shenyi stepped forward, pretended to be Qianlong, led away the Japanese pirates, and was killed himself. During Qianlong's escape, he encountered Japanese pirates. Zuo Kuang and Deputy General Wang, who accompanied him, were injured one after another. The Lone Ranger and Jiang Shicheng, who had awakened, arrived, but they were outnumbered. While killing all the pirates, Zuo Kuang and Deputy General Wang died in battle. Jiang Shicheng was also seriously injured and was killed by Deputy Xiangzhu Yang who followed. Qianlong was once again in danger. Fortunately, Xue Shuying arrived in time and brought Qianlong and the princess to Shengfang Wuhui to ask for help from Master Dong. The martial artists of Shengfang Wuhui understood the righteousness and were determined to protect Qianlong to the death for the sake of national peace. Yamaguchi Taro and Deputy Xiangzhu Yang surrounded Shengfang Wuhui with all the remaining elites. After a fierce fight, just when Xue Shuying was about to die under Yamaguchi Taro's knife, Xiao Yiming appeared. He and Xue Shuying worked together to eliminate Yamaguchi Taro and other Japanese pirates. In order to commend Xue Shuying for his three rescues and the patriotism of the Shengfang martial arts associations, Emperor Qianlong issued an imperial decree to build the "Imperial Guard" mansion. The Shengfang martial arts association was a royal association, in which civil officials got off sedan chairs and military officials got off horses. The emperor also wrote the names of the associations, "Turning Swing Association" and "Crossing Drum Association", with his own handwriting.