Just yesterday, Secret released the final comeback photo for member Hyosung in addition to revealing the tracklist for their comeback second mini-album titled Madonna. Today, the girls have released a video teaser of one of the tracks in their album called ???? / Empty Space. Empty Space is a ballad track that was composed by Kang Ji Won, Lim Sang Hyuk and Kim Ki Bum. The song expresses the feeling of having a hard time forgetting the lover that left, thus leaving one with an 'empty space.' This track is unique, as it is composed of only piano sounds and vocals, as you will soon hear below. Thanks to whimsicalchild for the tip and check out the teaser below! Stay tuned for their mini-album release and remember to purchase the album at YesAsia!