Billlie revealed another MV teaser for their comeback title song, "RING ma Bell (what a wonderful world)."

Just a day before, the Mystic Story girl group revealed the first music video teaser for their upcoming title song. In this teaser, Billlie gives a sneak peek at the new song with a strong rock band acoustic. On August 30 at midnight KST, the girls released the second music video teaser, where the members turned into rock stars.

Meanwhile, Billlie will release their 3rd mini-album, 'the Billage of perception: chapter two' on August 31 at 6 PM KST.