Geomungo

Geomungo, a six-stringed zither, is said to have been created by Prime Minister Wang San-ak of the Goguryeo Kingdom; its prototype is found in the ancient murals of Goguryeo.It has six twisted silk strings, which are stretched over 16 fixed frets.
The instrument is plucked with a short bamboo rod, which is held in the right hand, and produces majestic deep sounds. The literati of the Joseon dynasty particularly revered the geomungo.