This song was found with a very unique title. It did not have word of the artist name or the song. It simply said "Crazy Unbelievable vocal" (in Korean of course). The voice you are hearing is supposedly a vocal teacher of many famous artist. I say supposedly cause i read it in the comments and I wouldn't know the truth.
His voice is truly awesome and that is all you have to know. Awesome voice combined with a song that is able to show his skill.
Listen to Podcast(M4U with Denny) in