Choi Dong-hoon (born January 31, 1983), better known by the stage name Primary, is a South Korean hip hop musician and record producer. Formerly an artist under Amoeba Culture, he established his own record label PAKTORY Company on April 22, 2020.

Primary has collaborated with various artists to produce the albums Back Again, Primary Score, Daily Apartment, Primary and The Messengers, and 2. He has also produced albums for other Korean hip hop artists, including Supreme Team's first album Supremier and Dynamic Duo's Kill, as well as several of MBLAQ's singles, including "I'm Back" and "Smokey Girl". He appeared in the MBC variety program Infinite Challenge in 2013.