This is modern “bbong-jjak” music, which I guess is retro now because it’s from the 90s. Wikipedia calls it “Techno-trot“. The best explanation I could find is from Fancy Mag:

It sounded like a spastic auctioneer on methamphetamine chanting furiously over cheesy Casio keyboard riffs… Each [track] was a 25-minute non-stop party comprised of nonsensical scat yodels backed by a hypnotizing aerobicized beat…

The singer, E Pak Sa, is a Korean entertainer who has recently risen to super stardom in Japan. Thanks to our friends who laboriously translated several articles for us, we are able to provide some info on this unique madcap. This is pop music at its most extreme and now we unleash onto you the wonderful world of E Pak Sa (aka Dr. E.)… He learned Pansori from his musician parents while growing up. Pansori is a form of musical storytelling. It generally consists of a vocalist accompanied by drums…

E Pak Sa brought a new twist to the art of Pansori, as he contemporized the ancient tradition by incorporating modern, often Western, pop hooks into his passionate vocalizations. His reputation started to build based on his unique way of entertaining. While singing, he would imitate the sound of all of the instruments used in the prelude and interlude, and even the sound of the whistle used to gather the tourists. His nickname, Dr. E, came from his broad knowledge of various styles of songs.

Time to rent a bus, mic, and disco lights!

Ok. Now you might be ready for this:

This I cannot explain.