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.
Kei (singer) Kim Ji-yeon (; born March 20, 1995), commonly known by her stage name Kei, is a South Korean singer and actress. She made her debut as a main vocalist of South Korean girl group Lovelyz in 2014. She made her acting debut as the female lead in the web drama "Matching! Boys Archery" in 2016.