Billlie is MYSTIC STORY’s first K-POP project and is a global idol group prepared through MYSTIC Incubation Camp, which is MYSTIC’s unique artist incubation system. The team name, Billlie, contains the ambition of, ‘We will express our B-side, the inner self that everyone has and can sympathize with, beautifully and proudly.’ From now on, Billlie is going to do it’s best to show good music and images that can warmly touch the hearts of numerous Billlies everywhere.