Boynextdoor shows off their playfulness.

KOZ Entertainment uploaded the 'Dangerous' version of the concept photo for their 3rd mini album '19.99' on Boynextdoor's official SNS on the 26th.

This photo shows the atmosphere of the pre-released song 'Parents are not allowed to visit'. The group was captured gathered in a hideout. They enjoyed a free-spirited escape.

The individual photos show the unique personalities of the 6 members. They have chic eyes and quirky expressions. There were also many props such as balloons and lacquer sprays.

'19.99' is an album that expresses the time just before turning 20 with an imperfect number. It honestly sings about the worries of youths on the border between their teens and twenties.

'Parents are not allowed to visit' is being pre-released. The new song depicts a midnight escape that everyone has imagined at least once. It radiates the 'MZ power' of 19.99 years old.

Meanwhile, Boynextdoor will release '19.99' at 6 PM on the 9th of next month.