SEE ALSO: BBC releases documentary on the Burning Sun Scandal

Baechigi will release "Nightmare" feat. Park Soojin for Part 7 of the anniversary project which is a hip hop song with a powerful drum beat and minor-scale piano accompaniment.

The collaboration follows after Lim Chang Jung, 4minute, After School, Electroboyz, Juniel, and PINK BnN (A Pink's Bomi and Namjoo) who previously participated in Brave Brothers' 10th anniversary project.

Stay tuned for the release of "Nightmare" on the 31st!