Although Chu Nan now has a great deal of expertise in medicine, and has been learning medical skills from the old man since childhood, the problem lies in the fact that the old man's medical knowledge is entirely based on his personal understanding. If the old man were a highly skilled practitioner, there would be no issue; however, while his skills are indeed remarkable, he is not an encyclopedia and cannot pass on everything to Chu Nan. Medicine is vast and profound; relying solely on the knowledge taught by a master makes it difficult to reach a higher level. It's about the conversation with Yin Zhaotian in Chapter 0146.
Enough.
"It seems I should take some time to buy more medical books."
