The poem "Selling Charcoal Weng" is titled "Kugong City", which shows the darkness of the palace city system and the miserable living conditions of the working people.
In the poem, "A cart full of charcoal, more than a thousand Jin, an imperial envoy will drive a general", and "Half a horse with a red stripe, a silk, full of charcoal to the bull's head" fully expresses this point.