Li Cunxu
It is not known when Zhu Shouyin was born, and his background was not stated in detail in the historical records, although it is known that he was a child servant/attendant to Li Cunxu while both were children (specifically, when Li Cunxu began his studies), suggesting that he was close to Li Cunxu in age. After the death of Li Cunxu's father Li Keyong the Prince of Jin in 908, Li Cunxu became prince, and he made Zhu the commander of the Chengzhi Army (成直軍), but it was said that Zhu did not actually participate in campaigns but was (at that point) only carrying the military title. (However, later that year, when Li Cunxu's uncle Li Kening unsuccessfully plotted against Li Cunxu, Zhu was one of the officers that Li Cunxu, his mother Lady Dowager Cao, and the leading eunuch Zhang Chengye summoned to plan for a counterplot, and subsequently, Li Cunxu and the other main co-conspirator, Li Cunhao (李存顥), were arrested and executed.) It was said that throughout the years, Zhu informed on other officials/officers to Li Cunxu, garnering his trust.