Sometime in the middle of 2017, Hong Kong businessman Wong Muk-nam disappeared without a trace.The 62-year-old owned a plastic trading factory in Xingtan, a township of Foshan in Guangdong, according to a friend who lives in the mainland Chinese province but refused to reveal his name.“We were chatting on WeChat, but suddenly he was out of reach,” he recalled. “No responses to messages, phone calls. It was really unusual because he always responded quickly.”Then Wong’s name turned up as a key…
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