K-pop rookies BOYNEXTDOOR returned with a coming-of-age EP, '19.99' — signifies the transitory phase just before turning 20. Coming-of-age stories Penned by the members themselves, the seven-track release documents their personal stories and emotions as they stand on the brink of their twenties. ‘19.99’ features the pre-release track ‘Dangerous' and Korean and English versions of…