Kang Sung-hoon (hangul:???, born February 22, 1980) is a South Korean singer, best known as a former member of the 90s South Korean boy group Sechs Kies.
While in Sechskies, Sunghoon was the main vocalist and is referred to have had the best singing voice of the group.
After SechsKies had disbanded in 2000, Sung-hoon pursued a solo singing career, signed under Laful Entertainment at the time.
His nickname Hoony is the title for his third album.
Sunghoon joined Sechskies for their reunion in 2016, but left the group in early 2019 due to ongoing scandals.