One year, the respected General Secretary Kim Jong Un visited Wisong Primary School built in the Wisong Scientists Residential District. Going up the stairs to look round the gym on the upper floor of the swimming pool, he looked at the playground of the school through the window for a while. Then he asked whether it would be better to cover the playground with such turf as bluegrass or with artificial turf. At that time an official answered that it would be better to cover it with artificial turf as it would be used by naughty children. Then the General Secretary agreed with him and referred to the need to cover the playgrounds of Wisong primary and junior middle schools with artificial turf and provide educational institutions with perfect educational facilities.