When Mr Chen's 85-year-old father fell ill with Covid in December, it was impossible to get an ambulance or see a doctor. His father managed to find a bed at another hospital, but only through a special contact, and had by then developed a severe lung infection. The elder Mr Chen has now recovered... With mass testing, stringent quarantines and sudden, sweeping lockdowns gone, families like Mr Chen's are wary of what lies ahead. But younger Chinese, all of whom did not wish to be named, feel differently - and some told the BBC they were voluntarily exposing themselves to...