He started his career as a singer for those in power, and rose to high prominence due to his association first with military general Liu Zhiyuan, founder of the Later Han, and later Guo Wei, who founded Later Zhou.
Zhao Yan's family were all killed, and Wang Jun drifted among the common people until he served under Zhang Yanlang, the Later Tang fiscal commissioner (三司使), who did not value him.
Wang Jun, along with many other former Zhang Yanlang attendants, became servants for general Liu Zhiyuan, who was named Later Jin's military governor of Hezhong (河中; roughly modern Shanxi).
[4] When Liu Zhiyuan founded the Later Han in 947, Wang Jun was named commissioner of diplomatic accommodations (客省使) and accompanied general Guo Congyi (郭從義) during the latter's suppression of Zhao Siwan's (趙思綰) rebellion.
[4] Guo had invited Liu Yun, a cousin of the late emperor, to the capital to ascend the throne, while he took his army northward to resist a Khitan-led Liao Dynasty invasion.
[4] Wang also requested replacing fellow chancellors Li Gu and Fan Zhi with Yan Kan (顏衎) and Chen Tong (陳同), but the emperor was reluctant to do so.