He inherited the leadership position of the Wanyan tribe from his uncle, Yingge (盈歌), in 1104.
Yingge died during the conquest of Helandian (曷懶甸; present-day Hamgyong Province, North Korea) after pacifying the Tumen River basin.
Under his order, Shishihuan (石適歡) led a Wanyan army from the Tumen River basin to subdue rival Jurchen tribes in Helandian and advance southward to chase about 1,800 remnants who defected to the Korean kingdom Goryeo.
However, Shishihuan defeated Im Kan north of the Chŏngp'ŏyng wall and invaded northeastern frontier of Goryeo.
However, when Wuyashu's delegates, Aguo (阿聒) and Wulinda Shengkun (烏林答勝昆), arrived in Goryeo, the Koreans killed them and dispatched five large armies led by Yun Kwan to attack Helandian.