HIGH4:20 reveal the MAMAMOO member featured in their debut song 'HookGA'

HIGH4 is ready to launch its first sub-unit, HIGH4:20!

They're going to be dropping a sick track "HookGA," which is now revealed to feature MAMAMOO's Hwa Sa!  This time, the teaser brings you to a full-on party scene with the boys standing on elevated ground, stealing the spotlight.  There are lovely girls in golden masks, ladies twerking their bootays, and just a lot of people having fun.

They'll be out with the ratchet track on October 3!