Wang Mu is one of the recurring characters in I Shall Seal the Heavens.
Wang Mu, along with most of the Chosen of the Ninth Mountain and Sea, made his first appearance during the opening of the Ancient Daoist Rite Temple in South Heaven.
Wang Mu, along with most of the Chosen of the Ninth Mountain and Sea, attacked Meng Hao to take the command medallion given to Meng Hao by Fang Xiufeng, which allows one to become a conclave disciple of the Ancient Daoist Rite Temple. After Taiyang Zi was captured he told Meng Hao to capture Wang Mu indicating there might be some enmity between them.
Meng Hao seriously injured Wang Mu during their battle and even stole his bag of holding.
After Fang Xiufeng and Meng Li told him to release all the Chosen, Meng Hao reluctantly let them go.
After Meng Hao reached True Immortal Ascension, he defeated Wang Mu after the latter challenged him.
During the war with the 33 Heavens, he was outraged and utterly embarrassed that his Patriarch decided to turn traitor to the Mountain and Sea Realm by surrendering to the Immortal God Continent and tried to fight with the Mountain and Sea Realm but was subdued by his clan members and made to lose consciousness.