CLASS:y will be making a comeback in just five more days with their 2nd mini-album.

On October 21 at midnight KST, the girls released the drama ver. of the music video teaser for "Tick Tick Boom," which is the title track from the 2nd mini-album titled 'Day & Night.'

CLASS:y will be dropping their new mini-album on October 26, so stay tuned for more teasers until then!