Some machines are operated by Zailouxia, which translates to "downstairs".

The price is almost half that of the branded store downstairs and the wait time is next to nothing, so it's a no-brainer.

"We are busy at work and have no time to buy coffee at the store downstairs.

More people can receive goods at their doorstep or downstairs, since Beijing said at the end of April that express delivery workers can enter residential communities with green-code registration－a verification system for entering and leaving residential areas or densely populated public places.

"Guizhou is a place with a lot of precipitation, but Yu does not have to worry about rainstorms or hail affecting the mushrooms at night because "they are just downstairs".

"We can hold no more than 350 customers in the store, so when that number is reached, we have to stop people from coming in, and keep them waiting downstairs," He said.

"So I just went downstairs to have a look at the electronics market and found about five reliable suppliers.