Yan Jiu has lived on Changming Street since he was a child.
Changming Street, just like its name, is bright all the time.
But one day, Changming Street stopped lighting up.
Changming Street was also occupied by the feudal system.
From then on, Changming Street became Yongye Street.
From now on, Changming Street, where there is never darkness, is really... It will never be bright again.
From now on, there will be no more Changming Street in the world.
Purpose: Describe Datong and feudalism