The members Moon Sua and Siyun of the girl group Billlie made their unit debut within the team for the first time. They have attracted attention by undergoing a bold transformation that is completely different from what they have shown as Billlie. On the 7th at 6 p.m., Moon Sua and Siyun released the digital single ‘SNAP’ (feat. sokodomo) through various music streaming sites. ‘SNAP’ is a song with a highly addictive sound created by the two members who are in charge of rapping in the team, featuring a blade-like flow that cuts through the rhythm and a tension-inducing bass drop, enhanced by Moon Sua and Siyun’s strong and intricate rapping. This song showcases a different style from the songs Billlie has presented, drawing attention to the fact that Moon Sua and Siyun participated in the songwriting themselves. The song was worked on by songwriters such as Benjamin 55 and Stray 55, and rapper sokodomo contributed to the completion of the song as a featuring artist. The concept photos of the two members, which were released before their unit debut, also garnered attention. Moon Sua and Siyun presented a powerful yet charismatic visual by perfectly digesting the fencing core concept of ‘chrome noir’. While Billlie has released well-made songs such as ‘Ring x Ring’, ‘Doubtful’, and ‘Memory Candy’ while experimenting with various genres and experimental music, Siyun and Moon Sua showcased wonderful rapping that suits their music as rappers, and have been unleashing their potential by actively participating in rap making. ‘Billlie’s First Unit’ has gathered a lot of attention, and the ‘SNAP’ activities are generating high expectations.