SISTAR has just announced their first sub-group, ‘SISTAR19′ which consists of main vocalist Hyorin and rapper Bora! The number ‘19′ in the name represents the age of girls mature into women. It also embodies the sense of innocence yet uncertainty they feel.

A set of teaser photos for their title track, “Ma Boy“ was unveiled today, and fans were able to catch a peek into SISTAR’s ‘19′ concept.

Unfortunately, the ‘19′ caused dispute on what exactly it could mean. While some praised, “I can’t take my eyes off of Hyorin and Bora’s new charm”, “They’ve expressed the rebelliousness of girls their age through just their gazes,” and “Bora’s legs are captivating”, other asked, “Does the 19 mean it’s rated R?“, and “Will they be showing the innocence of the age 19, or…”

Starship Entertainment explained on what should they expect from this sub-group. “SISTAR19 will feature an explosive energy that can’t be seen with other girl groups. They’ll create their own charm with Hyorin’s powerful vocals and Bora’s strong rap skills.”

Their digital single will be released on May 3rd!

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