Hidden behind the high-rise office blocks and glitzy shopping malls of Hong Kong, a huge number of ordinary people have been left behind by the economic boom since the city returned to Chinese rule a decade ago.

As as international financial hub it boasts some of Asia's richest people and more Louis Vuitton shops than Paris or New York.

Yet out of its seven million residents, an estimated 1.25 million -- people like Kong and Tai -- live below the poverty line.

They share a room with nine other men in one of Hong Kong's notorious "cage dwellings" -- small, dingy flats that have been further subdivided into cages where there is no room for anything other than a bed.