What is the secret hidden under the Kim Hongdo’s painting, ‘Mu-Dong(Boy Dancer)’?

A child is dancing with excitement to the rhythm.
‘Mu-dong(Boy Dancer)’ by Kim Hongdo, the greatest court painter in Joseon Dynasty.
Actually, there are some secrets hidden in this paintings
With 6 musicians and a dancing child,
But nobody focused on the secret hidden in the painting until now.
What is the secret hidden unders the painting, Mu-dong(Boy Dancer)?
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