”One child was put on the mat for two hours”... Taekwondo instructor's abuse that led to the death of a 4-year-old boy in South Korea

It has been revealed that the head of a taekwondo dojo who killed a four-year-old boy by putting him upside down on the mat last year also put another four-year-old boy on the mat for two hours. The head of the dojo has abused more than 20 children.