When her family is killed by the evil Minister Ji Xian for refusing to become his wife, Yunfeng trains in kung-fu while awaiting her opportunity for revenge. She becomes "Sister Thirteen" and her brother fighters plot a plan to end Ji.
During the Yongzheng period of the Qing dynasty, Ji Xiantang, a powerful minister to the government relied on the emperor's favor and persecuted Wenwu Zhongliang, causing many tragedies. Ji Xiantang had heard that WenWu had a beautiful daughter, Yu Feng, which he desired as a concubine, but WenWu refused, so he set up an evil plan to kill almost all of he Yu Feng's entire family, young and old. Yu Feng endured the grief of losing her family and followed his father's instructions to escape with a sword and avoid the danger hiding in the deep mountains and dense forests. She vowed to kill Ji and avenge her hatred. Yu Feng worshiped Deng Jiugong as a teacher, endured the cold and the heat, and practiced hard kung fu. Deng Jiugong gave her a fighter's nickname: "Sister Thirteen". In the autumn of the following year, the sister thirteen heard that Ji Xiantang was going to return to the province, so she and her brothers ambushed under the bluestone bridge of the only road. Who knew that Ji had already made preparations, secretly "stealing beams and changing pillars", and all the brother fighters were stabbed to death, barely making it out alive Sister Thirteen. She learned that she had been deceived and infiltrated the Ji mansion to carry out the assassination, but due to the tight security in the palace, she failed. From then on, Ji secretly ordered the evil monk Tie Luohan to come out of the mountain. On the way to Hongliu village, sister thirteen overheard the two peasants discussing plotting to murder prince an and seize the money. Disregarding her own safety, she went to the yuelai shop to report to the kind an gongzi and raise three thousand yuan from the brothers to atone for the gongzi's salvation of his father. The prince credulously believed the bad guy's words, mistakenly entered the black dragon gang, was trapped in the Nengren temple, and was nearly poisoned by the fierce monks under the iron luohan. Sister Thirteen heard the news and arrived on horseback, fighting the fierce monks alone and saving the prince from danger. Unexpectedly, the thirteenth sister herself fell into the heavy ambush of the iron luohan on the way back, and she was eventually captured and imprisoned due to her weakness. Ji heard about the capture of the thirteenth sister and held a feast in the mansion to celebrate. Suddenly, a person from the celebration dancing girls assemble, flew out, holding a dagger, and stabbed Ji directly, and this person was none other than the Sister Thirteen. It turned out that on the way to escort, the thirteenth sister was rescued by the brothers and hidden among the other girl dancers. Ji had committed many crimes, and was finally killed by the thirteenth sister. Under the setting sun, the thirteenth sister prayed to the spirit of the deceased father in heaven, fulfilled her wish for revenge, and rode on a mule into the distance.
