With help from the treacherous Song dynasty general Pun Mei, the Khitan-ruled Liao dynasty army succeeded in trapping the loyal Song general Yeung Yip and his seven sons at Golden Beach. Yeung Yip and his sons were all killed or captured in the ambush, except for the 5th son and the 6th son who managed to escape. The 6th son returned home, but was severely traumatised by the events. Meanwhile, the 5th son sought refuge in a monastery in Mount Wutai, but the monastery leaders initially did not consider him calm enough to be a Buddhist monk. As blades were not allowed inside a monastery, he used his training in spears to practice with a pole, eventually developing the unique eight diagram pole fighting technique. When he finally appeared to have put his anger and past behind him, news broke that the Khitans had captured his younger sister, Yeung Baat-mui, who was looking for him. Now he must break Buddhist vows (including not kill and not be bothered by worldly affairs) to save Baat-mui and exact his revenge.