Kim Nam-joon, known professionally as RM (formerly Rap Monster), is a South Korean rapper, singer, songwriter and record producer under Big Hit Music.

He is the leader of the boy group BTS. Born in Seoul and raised in Ilsan, RM began his music career in the underground Korean hip-hop scene as a teenager, going by the name Runch Randa. He joined Big Hit in 2010, and debuted as part of BTS in June 2013.