The Mongolian meaning of Ulan Bator is 'palace' (note, it actually means 'Red Hero City', originally named Urga (palace), this is for the convenience of the reader's understanding).
This place was once where the royal court of Northern Xiongnu was located, and right beside it is the Mongwu holy mountain Kent, also known as Langjuxu Mountain —— the 'Langjuxu' where Marquis of Guanjun during the Han Dynasty was stationed.
After the Datan people rebuilt the royal tent in Ulan Bator, they also established a small-scale palace here, following the Mongo tradition.
The nobles of Mongwu were accustomed to living in brick houses; who would want to continue staying in a felt tent?
They were not like ordinary herders who had to move with the grass and water.
When Zhang Yue followed Li Xuan's footsteps and entered the small palace of Ulan Bator, he seemed somewhat confused.