Stellar talked about their sexy concept, which some people find too provocative, during their showcase for "Vibrato" on July 20 at the Rolling Hall in Seoul.

Gayoung said, "I think that when a girl hears she's sexy, [she finds it] a compliment.  As we get to do a sexy concept this time, we are doing so more grandly in order to take it on well." Junyool said, "Please don't look too much at the exposure only and watch our performance prettily.  We don't act tough.  We do everything with certainty.  It's the same with being sexy."

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Someone brought up that it would be difficult to establish a teen fan base due to their provocative concept.  Gayoung responded with, "The regulations for each show are different, so we don't have to worry.  Seeing as how many students watch music shows, we put a lot of thought into our outfits and choreography as we prepared."