The most powerful martial arts masters hidden in Water Margins might be Wu Yong and Gongsun Sheng. Wu Yong was one of Liang Shanpo's strategists. Although he was not as good at fighting as other strategists, his strategy and tactics were crucial to Liang Shanpo. Gongsun Sheng was one of the leaders of Liangshan Lake. He had outstanding martial arts and a mysterious background. He was once considered one of the most powerful experts in Liangshan Lake. Although Wu Yong and Gongsun Sheng were both hidden in the Water Margins, they were both masters in the martial arts world and had extraordinary strength. If one considered their background and status, they might be one of the most powerful martial arts masters hidden in Water Margins.