A Pink explain why they never did a 'sexy' concept so far

Regarding their consistent concepts, which typically don't deviate from girly and "innocent," Hayoung said, "It wasn't our declaration that we would never do [a] 'sexy' [concept], but rather we leaned toward a concept that was a good fit for the members, resulting in the kind of concept that we've maintained so far. Fans like it and so do the members, so we take that into account and try to upkeep [that concept]." 

Chorong added, "During our debut, we didn't specifically choose that concept; we just thought that it was the most fitting for our age range."

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A Pink also reasoned why they chose to work with Black Eyed Pilseung, saying, "We've always received songs from different producers, and rather than say we switched the producer we work with for a change, we chose this producer because we believed that the song was very similar to the kind of concept we were thinking of."