The BGRLT displayed on the music board all represent

bboy is the abbreviation of "beat-boy" in English, which refers to a fan who is very keen on hip-hop culture, mainly People who followed the original hip-hop cultural movement in the early 1970s. Usually break dancers too.

Bgirl is the abbreviation of "beat-girl" in English. In hip-hop culture, it is the female equivalent of B-boy. Specifically refers to women who practice break dancing styles.

bboy's dance is called GoodFoot, named after James Brown's record. Good Foot was the first freestyle dance, consisting of drops and spins, and similar steps to the early days of breaking.