Kim Jung-gu (Korean: 김중구, born February 10, 1990), also known by stage name R.Tee (Korean: 알티), is a South Korean record producer, songwriter, and DJ signed with The Black Label. He has produced songs for artists including Big Bang, Blackpink, iKon, and Winner. Recently, he became a major producer for the rookie group TREASURE, playing a substantial role in the production of their discography, including main singles "Boy" and "I Love You" (사랑해).