郑注
While Li Su was still at Wuning, one of his subordinates recommended the physician Zheng Zhu to him, as he was often ill. Li Su's conditions improved after taking Zheng's medication, and he became closely associated with Zheng, such that Zheng became powerful over his staff members and were often interfering with governance. When the eunuch monitor Wang Shoucheng found the situation to be inappropriate and asked Li Su to remove Zheng from his staff, Li Su told him, "While Zheng Zhu is frivolous, he is talented. You should try to meet with him. If you really find him to be useless, I will remove him." Wang initially did not want to meet Zheng, but eventually agreed. After he did so, he was also pleased by Zheng's amusing speech, and therefore also became closely associated with Zheng. Zheng, not wanting others to know about how he first became associated with Li Su and Wang, subsequently falsely accused the officer who had initially recommended him, and Li Su executed the officer.