When did the group debut that Kang Sung-hoon is a part of?
Sechs Kies SECHSKIES (pronounced as , Korean: 젝스키스 , Japanese: ジェクスキス ) is a six-member South Korean boy band in 1997. They are the "1st-generation K-Pop idols" and were named as one of the top boy groups in the 90's. Consisting of members Eun Ji-won, Lee Jai-jin, Kim Jae-duck, Kang Sung-hoon, Ko Ji-yong and Jang Su-won, the group debuted on April 15, 1997.
F(x) (band) f(x) ( ; Hangul: 에프엑스 ) is a South Korea-based girl group formed by S.M. Entertainment in 2009. Since their debut, f(x) has released four full-length albums, two extended plays, and one repackaged album. The group is currently composed of four members: Victoria, Luna, Amber, and Krystal. It was originally a five-piece group (with Sulli, who later departed from the group in August 2015).