Lee Sung-hyun (이성현, born in 1972), also known as Mowg (Korean: 모그; RR: Mogeu), is a bassist and composer of primarily film scores. Mowg has won the Best Music Awards for films, including I Saw the Devil (2010), Masquerade (2012), Hwayi: A Monster Boy (2013), Dongju: The Portrait of a Poet (2016), The Age of Shadows (2016) and Burning (2018). He was named Mowg because of his similar appearance to Mowgli in the The Jungle Book.
In addition to his work in film, Mowg has produced albums by other artists, including the debut album by Korean pop star Jang Yoon-ju, Dream.