RM Collaboration with Kan Mi-youn
Release Date: February 21, 2011
RM Collaboration with Lee Hyun, Jiyeon, and IRON
Release Date: February 15, 2011
RM Collaboration with 2AM
Release Date: October 26, 2010
RM Collaboration with Lim Jeong Hee and IRON
Release Date: September 30, 2010