On a farm up in the hills of South Korea’s Jeju Island, investigators this week uncovered what a mother had spent three months fearing they would not find: the body of her daughter. Jang Mi-ran, 37, vanished without a trace in May. Police records would later show her case had been quietly closed without anyone ever verifying if she was alive. It was the second such discovery in a matter of days. The first was the skeletal remains of a man in his sixties, found on Saturday after his family warned...