One day in October Juche 102(2013) the respected Comrade Kim Jong Un visited the completed Munsu Water Park.
Going round the indoor water park, he suddenly threw his eyes to the artificial waterfall.
Having looked at it for a while, he said that the sound of waterfall was too high and a proper measure should be taken to remove the noise.
He considered that the great sound of waterfall inside would make a trouble to the people.
Thus, the sound of waterfall got low.