Ryu Sung-min (Korean: 류성민; born February 28, 1993),[2] better known by his stage name C Jamm (씨잼), is a South Korean rapper.

He released his debut album, Good Boy Doing Bad Things on July 17, 2015.

[3] He is the runner-up of Show Me the Money 5, behind the winner, his childhood friend, BewhY.

[4] On 3 March 2022 after his release of EP, he left his label, Just Music.