Ji, who noted that the boy was extraordinary. By the time Zhong Hui reached adulthood, he was already famous for being hardworking, well read, and versed in different types of arts. During the Zhengshi era (240–249) of the reign of Cao Fang, he served as a Gentleman Cadet of the Imperial Library () and was later promoted to Attendant Gentleman of the Palace Writers and Masters of Writing (). He was awarded the title of a Secondary Marquis () when Cao Mao ascended the throne in 254. Zhong Hui studied the Yijing. After his death, a 20-volume book titled Dao Lun () was discovered in his house. The book, which was believed to be written by Zhong Hui, discussed either Legalist or Logician philosophy even though its title suggests it was about Taoism. When he reached adulthood, his fame placed him on par with the philosopher Wang Bi, who was about the same age as him. Gaining the attention of Sima Shi The Shiyu recorded an incident about how Zhong Hui came to the attention of the Wei regent Sima Shi. Sima Shi instructed Yu Song (), the Prefect of the Palace Writers (), to draft a memorandum. He was not satisfied after reading Yu Song's draft and ordered him to rewrite. Yu Song was unable to think of a better way to write the memorandum after racking his brains and felt gloomy. Zhong Hui noticed Yu Song looked troubled, so he offered to help him and changed five words in the memorandum. Yu Song was pleased after looking through Zhong Hui's edits and he presented the revised draft to Sima Shi later. After reading it, Sima Shi asked him, "You didn't make these changes. Who edited it?" Yu Song replied, "Zhong Hui. I've been wanting to recommend him to you, my lord. Now that you asked, I shan't keep him to myself anymore." Sima Shi said, "He's capable of shouldering greater responsibilities. Summon him." When Yu Song informed Zhong Hui that Sima Shi wanted to meet him, Zhong asked him about Sima's abilities, to which Yu replied, "He's learned, wise and multi-talented." Zhong Hui stayed at home for about ten days, during which he refused to meet any visitors and carefully thought about what he would say to Sima Shi. On the day he met Sima Shi, he entered Sima's residence early in the morning and left only at