Mystic Story's upcoming new girl group Billlie has confirmed their official debut date.

On October 28 KST, Billie took to their official Twitter to release a time table image titled "Billlendar", where they listed the dates of all the important events leading up to their official debut. According to the unveiled time table, Billie will be releasing their 1st album on November 10, marking their official debut. 

Prior to their debut, Billlie will be releasing trailers, a photographic memory series, a full track list, and other various contents. In particular, Billlie revealed the title of their upcoming debut track "RING X RING" in the time table, showing that the teaser for "RING X RING" will be released on November 6.

Billie will be officially making their debut with "RING X RING", which will be released through various music platforms on November 10.