Korea Vertical Flutes - 한국 수직 플루트 - 퉁소 - 퉁소 단소 적 피리 - 觱篥 唐笛 洞簫 洞簫 - 韩国长笛

Tungso : also called Tongso, still very popular today.
Danso: often as a plastic variant, used in school to learn, like the western recorder.
Jeok: there is also a dangjeok as a transverse flute.
Yak: More commonly used as a utensil for dance events at ancestral memorials and in Confucian shrines.
Piri: The oldest Piri is the Hyang Piri, then comes the Dang Piri, the Se Piri is a later further development and the Dae Piri is a very young new development. Sound is very nice, similar to the oboe. The Chinese equivalent is called Huan and the Japanese equivalent is called Hichiriki.