As of 927, by which time Li Cunxu had died and been succeeded by his adoptive brother Li Siyuan as emperor, Sun was serving as a secretary to Zhu Shouyin the military governor (Jiedushi) of Xuanwu Circuit (宣武, headquartered in modern Kaifeng, Henan) [REF].
Sun, meanwhile, abandoned his wife and children, and hid himself in the region.