Joo (singer)

Jung Min-joo (Korean: 정민주; born October 11, 1990), born Jung A-rin and known professionally as Joo (stylized in all caps), is a South Korean singer, songwriter and musical actress. In 2006, she became a contestant on JYP Entertainment's Superstar Survival. Although she didn't win, she was accepted as a trainee at JYP Entertainment. After two years of training, Joo debuted as a soloist with her single album Young Girl in January 2008.