Following their pre-release track "Trampoline," Billlie continues preparations for the release of their 5th mini-album, 'appendix: Of All We Have Lost.'

On October 12 at midnight KST, the girl group dropped another track preview teaser for "Bluerose." "Bluerose" is the third track from Billlie's 5th mini-album.

Meanwhile, Billlie will be making their comeback with 'appendix: Of All We Have Lost' on October 16 at 6 PM KST. The girl group's title track is "Memory Candy," with lyrics co-written by IU.

SEE ALSO: Billlie chase away their struggles in jazzy 'Trampoline' MV