The most mysterious master in Jin Yong's novels might be one of the following: 1. Xiaoyao Sect Leader Xiaoyao Zi. The Xiaoyao Sect was a sect in Jin Yong's novel. Its founder was a Taoist master, Li Xiaoyao. The martial arts of the sect were known for their illusory and unpredictable nature. The mysterious disappearance of Xiaoyao Zi in the novel had never appeared, and his martial arts and background had always been the focus of readers 'speculation. 2. Huashan Sect Leader Yue Buqun. Yue Buqun was another Huashan Sect leader in Jin Yong's novel. He appeared to be a righteous and powerful sect leader, but in fact, he was a sinister and cunning person. He tried to achieve his goal by controlling the Huashan Sect, so he was considered one of the most mysterious characters in Jin Yong's novels. 3. The Four Friends of Mei Zhuang. The Four Friends of Mei Zhuang was a group in Jin Yong's novel. It was composed of Mei Zhuang, Zhuang Juxian, Zhou Botong, and Huang Yaoshi. Each of them had their own unique martial arts and background, and their actions were mysterious and unpredictable. The Four Friends of Mei Zhuang appeared many times in the novel, but they never appeared officially. Therefore, they were considered one of the most mysterious characters in Jin Yong's novels.