Yoo Sung-eun (Korean: 유성은, born April 26, 1989),[1] stylized as U Sung-eun, is a South Korean singer.

She was the runner-up on The Voice of Korea.

[2] She released her debut album, Be OK, on July 15, 2013.

[3][unreliable source?]

Yoo married rapper Louie of Geeks on July 11, 2021.