Who said Beijing Dragon was exhausted?

The exhaustion of Beijing's dragon's breath is an online buzzword, which originated from Chinese mainland's online novel "Choosing the Sky" and was later used by netizens to ridicule the serious smog phenomenon in Beijing. The novel compares the dragon spirit in Beijing to a kind of energy, which is considered as one of the important factors supporting Beijing's prosperity. But at the end of the novel, Beijing's dragon god runs out, which leads to the gradual decline of Beijing's luck. Therefore, some netizens used "the dragon in Beijing is exhausted" to describe that Beijing's luck has declined, as if it had lost its previous prosperity and glory. This statement has also been used by some people to ridicule Beijing's air quality and other issues.