The (South) Mount Heng Sect (衡山派) is led by a mysterious man called Mo Da. Its swordplay techniques are customised to suit musical themes. Mo Da is known for playing melancholic tunes on his huqin, where his sword is hidden. Mo Da's junior Liu Zhengfeng befriends Qu Yang of the Sun Moon Holy Cult. The duo share the same passion for music and they compose the musical piece Xiaoao Jianghu together. Zuo Lengshan leads his men to confront Liu Zhengfeng during the latter's retirement ceremony and eventually Liu commits suicide together with Qu Yang. Mo Da is the sole survivor from the sect after Linghu Chong saves the martial artists trapped by Yue Buqun in a cave.