SEE ALSO: Seventeen members display awesome choreography in teaser for "MAESTRO"

Members S.Coups (Seungcheol) and Hansol made fans swoon with their deep voices as they rapped 'like a loose cannon,' which was definitely a treat for those who've missed them. In other news, Seventeen will perform as a special guest at Brand New Music's BRANDNEW YEAR 2014' concert to be held at Olympic Hall, Seoul on December 7 (SUN) at 6 PM KST!

Check out the mixtape below!