Before being detained , Kim taught accounting at the Business Administration School of Yanbian University of Science and Technology ( YUST ) in the northeastern Chinese city of Yanji , near the China – North Korea border . According to Voice of America Korea reports , he was a regional director in charge of transporting foreign aid materials to several areas affected by the 2016 floods in North Korea , and his humanitarian work has gone on for more than 10 years
2016 floods
2016 North Korean floods
Kim Sang-duk (academic)