The girls of Rainbow have been preparing to make their return to the music scene, and they've just released some teaser photos! DSP Media released these photos on the 18th to build some hype for Rainbow's upcoming song, "Mach." Instead of their girly image, the girls have been made up to pull off a provocative look with their leather outfits. Their company disclosed, "They've only shown innocent and sexy sides. They will show an image that will be upgraded. They will transform into the sexy dominatrix image. " "Mach" is a fast,energetic track designed to reflect the lyrics about a girl falling in love at first sight and wanting her lover to approach her faster than the speed of lightning. It will be released on the 21st. Source: Newsen Photo: DSP Media