Korean Traditional Instruments(Kkwaenggwari)

 https://youtu.be/I3c--xzOZm4

Kkwaenggwari is a small flat gong used primarily in folk music in Korea. Its is made of brass and is played with a hard stick. It produces a distinctively high-pitched, metallic tone that breaks into a cymbal-like crashing timbre when struck forcefully. The instrument's name is probably onomatopoetic for the sound the instrument produces, " kkwaeng- kkwaeng" ( hangul:꽹꽹).[1] An alternate name is swe (쇠).

References:

https://en.wikipedia.org/wiki/Kkwaenggwari

http://www.soundofasia.com/kkkotrsmhago.html