Billlie are collaborating with IU for their comeback track.

According to reports on October 8, IU participated in Billlie's comeback title song "Memory Candy" from the girl group's upcoming 5th mini album 'Appendix: Of All We Have Lost'. 

This comeback is particularly significant as Billlie returns as a full group of 7 members, Sihyun, Sean, Tsuki, Moon Sua, Haram, Suhyun, and Haruna, after a year and 7 month hiatus. Having regrouped as a complete team, Billlie will present a special collaboration with "hit icon" IU.

Billlie are also known to have collaborated with members of the 'IU squad' during the production of their debut album, including lyricist Kim Eana, composer Min Soo, CEO Cho Young Cheol, and director Hwang Soo Ah.

Billlie's 'Appendix: Of All We Have Lost' is set to drop on October 16 KST.   

SEE ALSO: Billlie drops teaser video for 'The Savior'