Old Hua was in high spirits, and upon hearing Xu Renhai's question, he immediately spoke: "Have you heard of the 'Green Satchel Book'?"
"The 'Green Satchel Book'? Could it be the one by Divine Doctor Hua Tuo?" Xu Renhai looked surprised.
"That's right! It's indeed this book."
Old Hua solemnly explained: "Back then, Hua Tuo was imprisoned by Cao Cao. To prevent his medical techniques from being lost, he wrote the 'Green Satchel Book,' this monumental medical masterpiece, while in prison. Later, Hua Tuo handed the book to the guard watching over him, hoping it would be passed down through the ages! In the end, due to an accident, the second half of the 'Green Satchel Book' was burned by the guard's wife."
