Chang'an, now Xi'an.
It has been renamed numerous times, including Fengjing, Haojing, Xianyang, Chang'an, Jingzhaofu, etc.
This place is called Chang'an and is as prosperous as smoke.
Only time is immortal.
The protagonist of the story may be on-demand, or he may have a flash of inspiration while reading a book, and write essay after essay.