I think I have seen this from martial arts movies set in Hong Kong or Japan.
It seems at certain times of the year, this “snow” appears from the sky. Its actually seed or blossom from trees. It gives the parks in this area of the world a completely different look. There is lots of it that blows everywhere in these parks.
The parks here are often among the major attractions in Beijing such as the Forbidden City, Summer Palace and Tiananmen Square.
These wooden huts tend to be beautifully decorated, even looking upwards in the rafters.