Musanhyang(무산향), a traditional Korean court dance!!!
Musanhyang(무산향) is a kind of traditional Korean court dance. It features the rectangular frame which the dancer dances in.
Also, you can see the dancer singing a song at each gap. Like this way, Kisaengs often sang a song describing and prasing the King's achievements or virtues while dancing a court dance. I like her beautiful voice as well as the moderate movements~