Choi Dong Hoon (Korean: 최동훈, born January 31, 1983), better known by the stage name Primary , is a prominent South Korean hip hop musician and record producer. He is currently under Amoeba Culture. He has collaborated with project groups for albums Primary & Mild Beats, Primary School (P'Skool), Primary and The Messengers, The Primary Score. He produced Supreme Team's first album Supremier and Dynamic Duo's "Kill" as well as several MBLAQ singles like "I'm Back" and "Smokey Girl." He appeared in the MBC variety program Infinity Challenge in 2013.