Sung Jeong Shik, known professionally as Sung Dae Hyun, is a South Korean singer and former member of R.EF (알이에프). He graduated from Yongsan High School.

Before debuting, he worked as a disc jockey (DJ) since 1992. He made his debut in 1995 as the group's vocalist, rapper, and maknae with their first album, "Love Effect".

In 1998, the group moved away from rave music and began to produce hip-hop music. However, they decided to disband in 1999.

He debuted as a soloist in 2000 with his self-produced and self-titled album and also worked as a choreographer.

R.EF briefly came together in 2004 to release the single "Love is Hard" and had plans to produce an album but, that never happened. While the trio has not officially disbanded, they are on an indefinite hiatus.

(Source: MyDramaList) Edit Biography