#Yunho (TVXQ) "King of Invention" is trending in Korea.

● I want to sing at night. "Coin Karaoke Box," which is popular in Korea, is reproduced in a home apartment.

● Egg carton for soundproofing equipment, home delivery cardboard for exterior, smartphone karaoke app. An authentic school of 500 won per song.

● Moreover, it is foldable and not bulky.