Kang Sung Hoon is a South Korean singer, dancer, actor, entertainer and former member of SECHS KIES (젝스키스). He graduated from Korea Kent Foreign School.

He was scouted by DSP Media (DSP미디어; formerly known as Daesung Planning) when he was studying abroad in Hawai'i. He came back to South Korea and became a trainee. The agency originally wanted him and Eun Ji Won to debut as a duo, but with the huge success of H.O.T, the plan was changed in order to form an idol group.

He made his debut in April 1997 as SECHS KIES's main vocalist and visual with their first album, "School Anthem". They quickly gained a substantial fanbase and are credited with pioneering the idol scene and fandom culture.

However, the group officially announced their disbandment in May 2000 and released one final digital single, "Thanks". He then went on to promote as a solo artist, debuting in early 2001 with the album "Emergency".

Like several celebrities at the time, he did alternative service at a game development company in 2005. However, the Military Manpower Administration ordered him to enlist as his alternative service was rejected. He kept postponing his service due to a knee injury until his age became a factor as well. He was allowed to serve as a social service worker but again kept delaying his service until late 2013. To further complicate things, he was arrested in 2014 and sentenced to 1 year and 6 months in prison on fraud charges. The sentence was then commuted to 2 years of probation, and by the time the trial and appeals ended, he was considered too old to serve in the military.

In April 2016, SECHS KIES reunited during several episodes of "Infinite Challenge" and later signed a contract (except Ko Ji Yong) with YG Entertainment (YG엔터테인먼트). They began releasing new material again and celebrated their 20th anniversary with several concerts and a new album in April 2017.

He was then involved in more controversy when a fan meeting in Taiwan was cancelled and his fan club was accused of embezzling fan donations. He voluntarily decided to leave the group and the agency in December 2018.

After three years out of the industry, he signed with FX Entertainment (FX엔터테인먼트) and now promotes as a solo artist.

(Source: MyDramaList) Edit Biography