Before the coronavirus pandemic struck, Hongkonger Chu Lui, 49, lived in Shenzhen and travelled to Hong Kong every day to work as a chef.The divorced father of two moved to the mainland city alone in 2016, drawn by its low cost of living. The 900 sq ft two-bedroom flat he rented there cost about HK$2,800 (US$361) a month, whereas the going rate for a comparable flat on Hong Kong Island would be about HK$35,000 a month on average.“That was worth it. Life was stable,” he says. He did not mind…