A HYBE boy group has crushed their own sales record with their latest album. BOYNEXTDOOR, the fifth-generation boy group under KOZ Entertainment, made their comeback with the album 19.99 and the title song “Nice Guy” on September 9, KST. BOYNEXTDOOR | @boynextdoor_official/Instagram According to the data released by Hanteo, the album sold a whopping 609,666…