After debuting in March earlier this year, girl group CHI CHI is back with a new image and title song on today's episode of Music Core. For their "Longer" comeback (which is based off their remixed version of the track), the girls have gone for a more refined look, as opposed to the cute concept they originally debuted with. "Longer" combines strong clubhouse beats and a sentimental electronic sound; its lyrics express the passing of one's first love and the pain that follows thereafter. Check out their comeback stage below!