At home in Beijing, but still not locals

As the capital's population grows the city government is facing a growing challenge arising from the application of the household registration system. Du Juan reports.

Editor's note: This is the first in a series of reports looking at the effects of hukou, China's household registration system, on the lives of ordinary citizens who have left their homes to work in other areas and regions. More reports will follow in the weeks to come.

More than 20 million people live in Beijing, the capital of China and one of the world's great cities.