Girl group Billlie has dropped the track list for 'side-B: memoirs of echo unseen,' set for release on October 23 at 6 PM KST.

The group's 1st single album will feature the title track "DANG! (hocus pocus)" in both Korean and English versions, as well as Korean and English versions of the album's B-side track "BYOB (bring your own best friend)," which was also dropped as a single last month.

The countdown to Billlie's comeback continues in a few hours with a B-side spoiler dropping at midnight KST.