During the Lunar New Year, Hong Kong resident Guo Yongfeng returned to the Chinese mainland to visit his hometown of Harbin, the capital of the northeastern province of Heilongjiang. But the outbreak of Covid-19 on the mainland meant that he was required to spend 14-days in self-quarantine upon his return to Hong Kong. But Guo lives in a cubicle in a subdivided housing unit known as a “cage home”, and found it impossible to completely isolate himself until he managed to get a bed in a…