• Birthplace: Chungcheongbuk-do, South Korea
• Age: 34
• Height: 160
• Weight: 0
• Website: N/A

Hyosung, or sometimes known as 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. Hyosung 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. Hyosung debuted as a solo artist in 2014.

Jun Hyoseong was born in Cheongju, Chungcheongbuk-do, South Korea on October 13, 1989. Hyosung's name is derived from the word '유성' which is Korean for 'meteor'. She was named this way as her father and maternal grandmother saw a shooting star across the sky on the day of her birth. Hyosung's family struggled financially and she and her family earned extra money by delivering newspapers every morning since she was in 3rd grade. Ever since she was young, she was known amongst her friends for her singing and dancing skills. However, she never had thoughts of actually becoming a singer until she was in 6th grade.

In 2005, Hyosung failed her audition for talent shows hosted in Cheongju and Seoul. She later won an audition held earlier by the same management company in Cheongju in May 2005. She was then advised by an agent at Good Entertainment to audition for Mnet's "Battle Shinhwa" and was picked as one of the final twelve participants and among them, three were females.

She was picked as the final 6 and later went on to sign a recording contract with Good Entertainment. She signed officially in 2006 and started to live in the dorms with Yoobin and Uee as a trainee and started going to school in Seoul. Good Entertainment had initially intended for Hyosung to debut in a three-member group along with Yoobin and Uee, but ended up adding G.NA and Jiwon. They were set to debut as a five-member group called "Five Girls". In 2007, before their official debut, the group starred in a reality show on MTV called "Diary of Five Girls". Five Girls were never able to debut due to their company's financial issues.

In 2008, after "Five Girls" disbandment, she started working at a part-time job and managed to earn enough money to attend Inha University; however, her college life was short-lived.

However, she was faced with a larger obstacle during her 11th grade when her father was diagnosed with lung cancer, though he initially recovered after treatment. Her father was still weak when he decided to go back to work to support his family and the cancer recurred, this time being much more aggressive. The doctors told Hyosung's family to "be ready". Her father died of lung cancer in 2008. At this point, Hyosung was no longer a trainee with Good Entertainment and had decided to start attending college again. However, her plans changed when a TS Entertainment agent contacted her.

In 2008, a TS Entertainment agent had seen Hyosung in "Diary of Five Girls" and contacted her to audition for their company. Hyosung passed the audition and began living as a TS Entertainment trainee. TS Entertainment announced that they would debut a four-member girl group in October 2009. Hyosung, along with Han Sunhwa, Song Jieun and Jung Hana, debuted as the group, Secret. Prior to their debut, the group appeared in a documentary called "Secret Story" which chronicled their debut process. They released their debut single "I Want You Back" in October 2009.

In April 2010, Secret released their first mini album entitled Secret Time which spawned the hit single "Magic" and served as their breakthrough song in South Korea. In August 2010, they released their second mini album entitled "Madonna" and the title track continued their success as it topped the Gaon Single Charts.

In January 2011, the group deviated from their "sexy" and "sassy" image and released Shy Boy, a "cutesy" and retro inspired song. Although they were worried with the 180 degrees transformation, the single exceeded their expectations as the song was a huge success. Shy Boy charted strongly in digital charts and Secret won their first trophy on music shows with the song. They won a total of 5 trophies in various music shows with Shy Boy. In March 2011, Hyosung was chosen as a regular cast on KBS's Oh! My School. Secret continued their success with the release of their second CD single entitled "Starlight Moonlight". The title track became another hit for Secret as the song reached number one on the Gaon Monthly Singles Charts and won them another trophy in SBS's Inkigayo.

The same year, Secret began a foray of Japanese activities with the Japanese release of Madonna and Shy Boy. The Japanese remake of "Madonna" debuted at number nine in the Oricon singles charts. Secret was the third of three Korean girl groups to debut on the Oricon chart in the top 10, the others being Kara and Girls Generation. In October 2011, they released their first studio album entitled "Moving in Secret" and spawned them another hit with the lead single "Love is Move. Secret released their first mini album in Japan entitled Shy Boy. The mini album also debuted at number nine on the Oricon album charts.

On November 23, 2011, Hyosung was injured after falling down a flight of stairs while leaving the dorm. The accident, which ruptured the cartilage in her left knee and fractured the top of her right foot, halted her promotional activities with Secret.

In February 2012, she played Soo Yeon in the sitcom Salamander Guru and The Shadows that aired on SBS.

On the October 21, 2012 episode of Inkigayo, the live music show revealed a teaser video hinting that twenty of the most-wanted K-pop stars would transform into four new project groups in the yearly event. Hyosung will be part of the girl group Dazzling Red with Sistar's Hyolyn, 4minute's Hyuna, After School's Nana and KARA's Nicole. Brave Brothers was set to produce the group's new title song. Slated to air on December 29, the group will perform the tunes only one time on stage and the profits from online streaming and downloading of the songs would be donated to people in need. The song "This Person" was released on December 27, 2012.

On August 6, 2013, it was announced that Hyosung would make her drama debut as Han Na Young in Orion Cinema Network's drama, The Ghost-Seeing Detective Cheo Yong. She starred in the ten-episode drama with Oh Ji-ho and Oh Ji-eun. Hyosung started filming in the middle of August, to make it in time for the premiere on February 9, 2014. In relation to this, according to Hyoseong, she received hard acting training from the drama director during the various shoots for the drama. The drama series ended on April 6, 2014.

In 2014, it was confirmed that Hyosung would be the second member of Secret, after Song Ji-eun, to make a solo debut.

TS Entertainment's initial statement was then followed by another through an interview with Star News on April 17, 2014, the day after. The TS Entertainment representative released a statement saying, "Hyosung will release her solo album on May 12 and begin her official activities."

On May 12, 2014 Hyosung's solo debut album titled Top Secret was released. The single album has three songs, titled: 여자를 몰라 (You Don't Know Women), 밤이 싫어요 (I Hate The Night), and Goodnight Kiss, the latter being the lead single of Hyosung's solo debut album. The song 여자를 몰라 (You Don't Know Women) also featured 제이켠 (J'Kyun). In a pre-order release by YesAsia, it was revealed that Hyosung would be releasing two sets of her albums: a normal and a limited edition. Hyosung held her solo debut showcase titled Top Secret Showcase, to present her debut album. The showcase was held at the Ramada Hotel Club Vanguard on May 12, 2014.

In 2014, Hyosung was cast as Han Soo-ri on the KBS1 daily drama My Dear Cat. The drama aired from June 9 to November 21, 2014.[32]

Hyosung released her first extended play titled Fantasia on May 7, 2015. Into You was promoted as the lead single. Hyosung also took part in writing lyrics for the album writing the track titled How Can I. On music programs, Taxi Driver was promoted along with the lead single. In the same year, Hyosung reprises her role as Han Na Young in the second season of Orion Cinema Network's drama, The Ghost-Seeing Detective Cheo Yong.

Hyosung released her second extended play titled Colored on March 28, 2016. Find Me was promoted as the lead single which featured TS Entertainment labelmate D.Action from the hip-hop duo Untouchable. Hyosung co-wrote the lead single while also writing lyrics for other songs on the album such as Dear Moon which was promoted on music programs alongside the lead single.

In May 2016, it was announced that Hyosung was cast as Park Bo-yeon in the thriller drama, Wanted. Hyosung's work on the drama earned her the Special Acting Award – Actress in a Genre Drama at the 2016 SBS Drama Awards.

In October 2016, it was announced that Hyosung would be replacing Cao Lu as one of the hosts on the talk show Video Star. The show's producer explained Hyosung was chosen as one of the new hosts because she "has great passion and perseverance for work, and she is going to have awesome chemistry with other show hosts. Viewers will be impressed with her realness and honesty." Hyosung has been one of the talk-show hosts since October 18, 2016.

In 2017, Hyosung was casted as Kim Gyori on the tvN drama Introvert Boss. Hyosung expressed her difficulty with this role in an interview with BNT International stating, "It was frustrating. I'm not the type to keep things to myself, but Gyori was the opposite. I think a lot and can be shy, but I am extroverted to the extent that I express what I want to say. The director allowed us to ad-lib some parts, and it was hard at times to keep my real outgoing personality from coming out." The drama aired every Monday and Tuesday from January 16 to March 14, 2017.