YOU SAID:
The whole world knows what is KPOP
INTO JAPANESE
全世界がKPOPとは何かを知っています
BACK INTO ENGLISH
The whole world knows what KPOP is
INTO JAPANESE
全世界がKPOPが何であるかを知っています
BACK INTO ENGLISH
The whole world knows what KPOP is
That didn't even make that much sense in English.