Gu Zong was asking Gu An to write a book about his deeds, and naturally, Gu An would not refuse, after all, it wasn't as if he was being asked to cast Gu Zong as the main protagonist of "Investiture of the Gods."
As an exchange, Gu Zong would elevate Gu An's status to that of an Outer Disciple and grant him a Medicine Valley twice the size of Mystic Valley.
Six months later, Gu Yu would go to find Gu An with the items.
Writing a book in exchange for a Medicine Valley, Gu An felt it was a good deal, as he had nothing else to do on normal days.
That night, after returning to his room, Du Ye pressed Gu An for details about what Gu Zong wanted with him.
"Sect secrets, are you sure you want to pry?" Gu An asked meaningfully, instantly frightening Du Ye to the point where he shuddered all over and dared not inquire further.