Jiangjin county in south-west China is known for its expansive forests and soaring mountains.
It is home to the Simian Mountain, which stands over 5608ft (1709m) above sea level. The stunning Wangxiangtai (Bridge of Nostalgia) Waterfall cascades down, rushing into the ferocious Chaba River.
Tourists come to revel in a landscape of outstanding natural beauty. Photographers make a living selling prints of images taken here. There is hardly anywhere to turn, which isn't intensely picturesque.
There are more prosaic industries making their livelihoods from this rich corner of the Chongqing province. Timber businesses thrive, as does agriculture of all kinds. The Jiangjin orange comes from here.
For Liu and Xu, the area held greater possibilities. Their village was nestled in its valleys, but the peaks above offered a wilderness in which they could get lost. The forest was so vast that people could wander the mountainside forever, without ever meeting another human being. This sounded perfect to the couple, as they desperately sought to escape the censure of all they knew.
Liu found a cave. It was far away from the trails and no-one ever went there. It had none of the conveniences of a home in the valley - no running water or wells, no proximity to the shops, no rooms or windows, no lights - but it was isolated. They could give their marriage a chance here. They would be left alone with their love.
The couple arrived with nothing but each other and their children. Their first priority was sheer survival. They had shelter, but no food. Xu searched the forest for wild fruit and roots, just to keep them alive. Liu cut down wood and fashioned it into furniture. At night, it was pitch black in their cave. Liu found an old ink bottle and turned it into a kerosene oil lamp.
Struggle by struggle, the couple created a virtue of necessity. As each challenge presented itself, they found solutions together. As the months passed, they forged a home from the stark cave and made it a comfortable place in which to raise their family.