Han Sen left Xie Qing King in the shelter and returned to the Alliance. Xie Qing King had said that he wanted to read some human books, and while Han Sen was happy to oblige, he didn't have any books he could give the spirit. After all, Han Sen could not risk leaking important human information.
The deal was still in place, too, in which Xie Qing King would help Han Sen eliminate Holy-Sword Emperor and conquer Holy-Sword Shelter. So, by giving Xie Qing King books as requested, Han Sen thought he'd be in a better mood to assist.
Han Sen tuned into a TV show discussing classic books and composed a list from that.
Then, Han Sen purchased a number of the books, in physical format, and placed them in a box to give to Xie Qing King.