Jun Hyo-seong often simply known as Hyoseong or Hyosung, is a South Korean singer and actress.
In 2005, she was a finalist in Mnet's Battle Shinhwa which led to her signing a recording contract with Good Entertainment. In 2007, she was going to debut in the group Five Girls, with G.NA, Wonder Girls' Yubin, After School's Uee and former T-ara member and former Spica member Yang Jiwon; however, the group disbanded before they were able to debut due to the company's financial problems. Hyoseong was later discovered by TS Entertainment through a show aired on SBS MTV called Diary of Five Girls and spent two years with the company as a trainee. In 2009, she debuted with Song Jieun, Han Sunhwa and Jung Hana as the four-member girl group Secret. Hyoseong debuted as a solo artist in 2014.