1, Song Wu, nicknamed "Walker", also known as Wu Er, was born in Qinghe County, Shandong Province. Song Wu died when his parents were young and was raised by his brother Wu Dalang.

2. Song Wu studied martial arts since childhood, with high martial arts and a quick personality. Once drunk, he killed a tiger with his bare hands in Jingyanggang, yanggu county, and was appointed as the county magistrate by Yanggu County Magistrate. Song Wu's brother Wu Dalang is a dwarf, and his beautiful wife Pan Jinlian tried to seduce Song Wu, but was rejected. Later, she was seduced by a local rich man, Ximen Qing. They poisoned Wu Dalang after it was exposed. In order to get revenge, Song Wuxian killed Pan Jinlian first and then Ximen Qing, so he was found guilty and exiled to Mengzhou. In Mengzhou, Song Wu was taken good care of. In return, Song Wu beat Jiang Menshen as drunk as a fiddler and helped En Ci recapture the Happy Forest.

However, Song Wu was also assassinated by Jiang Menshen in collusion with the government and forced to kill. In the process of escape, with the help of Zhang Qing and Sun Erniang, he pretended to be a "walker" and practiced with his hair. After Song Wu defected to Erlong Mountain, he became one of the three leaders of the "Rebel Army", and returned to Liangshan when the latter three mountains fought Qingzhou.