Hundreds of aspiring hip-hop rappers, four teams, and only one winner. Rap producers The Quiett and Dok2, rapper and actor Yang Dong Gun, former 'SMTM' contestant Swings, rap genius San E, Tablo, and Masta Wu all serve as producers and mentors to aspiring and veteran hip-hop rappers. Each week, the contestants will go head-to-head and give everything they've got until only one remains.