Question: What was the first single by the former band member and leader of "1st-generation K-Pop idols" in South Korea?

Context articles: Power Rangers Dino Force Brave
Sechs Kies
After School Club
Nihil
Korean pop idol
Eun Ji-won
Take You Home
Secret videography
Going Blind (The Go-Betweens song)
The Black Path (album)

Power Rangers Dino Force Brave () is a 2017 South Korean tokusatsu television show produced by Daewon Media, the same company which distributed the Super Sentai Series in South Korea under the "Power Rangers" label despite being unrelated to Saban Brands.
 It serves as a sequel to the 2013 Super Sentai Series, "Zyuden Sentai Kyoryuger" after its successful popularity in South Korea.
 Toei Company, the original owner of Super Sentai Series also collaborated in the filming.
 "Kyoryuger" director Koichi Sakamoto returned to direct the series.
 The show began its broadcast in South Korea on April 1 with two episodes a week for the first two weeks before moving to one episode a week starting April 15.
 The majority of the main cast is composed of K-pop artists.
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.
After School Club, often shortened to ASC, is a South Korean internet-based live-music request television talk show co-hosted by Kevin Woo, Park Jimin, and Jae.
 K-pop idols Jang Han-byul and Eric Nam were the original main hosts of the show, and departed in January 2014 and April 2016, respectively.
 Debuting on April 17, 2013, it is produced by Lee Hyun-ah and airs on Arirang TV.
 ASC features various musical guests of South Korea and the series is directed at an international audience so the principal language is English with Korean subtitles and translations produced on air.
 It allows international fans of K-pop music to interact directly with the live shows through social media: fans can join in on the live broadcasts through video chats in Google Hangouts, send in tweets to the show's official Twitter account, and are also able to share comments, ask questions, and request music videos on the show's official Facebook account.
 The show is also available on Viki (website), a community for subtitles, Soompi, and on DramaFever.
Nihil is the eighth studio album by industrial rock group KMFDM, released on April 4, 1995 on Wax Trax!
/TVT.
 "Nihil" was recorded in 1994 in Seattle, Washington, and marked the return of former band member Raymond Watts and the first appearance of journeyman drummer Bill Rieflin.
 The album was mostly written by band leader Sascha Konietzko, who emphasized a less guitar-driven sound for the release.
 "Nihil"'s first single, "Juke Joint Jezebel", is the band's most widely known song of all time, with millions of copies sold over various releases.
 Widely praised by critics, "Nihil" is the band's best-selling album.
 After the original release went out of print, a remastered version was released in 2007.
Korean pop idol, or K-pop idol, is a South Korean musical artist signed under a mainstream entertainment agency.
 In South Korea, potential idols are commonly cast by agencies via auditions or street casting in order to become trainees.
Eun Ji-won (born June 8, 1978) is a South Korean rapper, host, dancer, composer and leader of the first generation idol group SechsKies (젝스키스).
 After the group's disbandment in 2000, Eun pursued a solo career in 2001 with his first single ("A-Ha") and has mainly focused on hip-hop ever since.
 In addition to his music career, he has appeared on hit shows like "2 Days & 1 Night," "Reply 1997" and "New Journey to the West.
"Take You Home" is a song by British-Norwegian boyband A1, released as the lead single from their fourth studio album, "Waiting for Daylight".
 Released nearly a year prior to the album, it is the group's first single release not to feature former band member Paul Marazzi, as he left the group seven years prior.
 The single was released on 2 November 2009 in Norway only, after heavy promotion of the song on "The X Factor" in Norway.
 The song peaked at No. 9 on the Norwegian Singles Chart, and at No. 3 on Norwegian iTunes.
 The track also served as the 2009 Norwegian Comic Relief charity single.
The videography of South Korean K-Pop band Secret consists of twelve music videos, 1 concert tour video, 2 music video compilations, 1 music video single and three promotional videos.
 In 2009, Secret signed a recording contract with TS Entertainment and released their first single "I Want You Back" which became their first music video.
 Secret's first music video to receive attention in South Korea was "Magic" and became one of their popular songs because of its choreography.
 The same year, the group released "Madonna", which featured a sophisticated image for them, as the song lyrically tells about living with confidence by becoming an icon in this generation, like the music icon Madonna.
 In early to mid-2011, the group departed from their sexy image and released "Shy Boy".
 The song ushered a new image for Secret which was inspired by the American 50's fashion and features a "cutesy" concept.
 Secret continued to channel the image of their previous single with the release of "Starlight Moonlight" and maintained the "retro" theme.
"Going Blind" is the first single by Australian indie group The Go-Betweens taken from their seventh studio album, "The Friends of Rachel Worth".
 It was released as a CD single by W. Minc Records (the label of their former manager, Steve Miller) in Australia, on the Circus Records label in the United Kingdom and Jetset Records (for whom former band member, Robert Vickers, was the label's publicist) in the United States in September 2000.
The Black Path is the fourth major studio album by the German band Emil Bulls, released on April 4, 2008.
 The first single from the record is "The Most Evil Spell", released on March 7, 2008.
 "The Black Path" was the first album released by the group without longtime collaborator and former band member Paul Rzyttka (DJ Zamzoe).