Lee Chang-sun, better known by his stage name Lee Joon, is a South Korean actor, singer, model and DJ. He is best known as a former member of the South Korean boy band MBLAQ. He had notable roles in Gapdong (2014), My Father Is Strange (2017), The Silent Sea (2021), Bulgasal (2021).

M Countdown (Korean: 엠카운트다운) is a South Korean music program broadcast by Mnet from the CJ E&M Center Studio in Sangam-dong, Mapo District, Seoul. It features appearances by popular music artists who also perform live on stage. First hosted by Leeteuk, Shindong, and Kangin of Super Junior, the show has had several other celebrities serve as emcees through the years. As of January 2024, M Countdown is hosted by Sung Han-bin of Zerobaseone, Lee So-hee of Riize, and Myung Jae-hyun of BoyNextDoor.