Forestella is indeed a remarkable South Korean crossover male vocal quartet. They were formed through the JTBC singing competition Phantom Singer 2, which aired in 2017¹²³. They won first place on the show and officially debuted on March 14, 2018, with the album Evolution. Since their debut, they have released another two studio albums and gained public recognition for their performances on Immortal Songs: Singing the Legend, festivals, and other televised concerts.
The quartet was formed through the second season of the singing competition Phantom Singer. The members, Cho Mingyu, Ko Woo-rim, Bae Doo-hoon, and Kang Hyung-ho each separately auditioned for the competition¹. During the competition, Cho Mingyu selected Ko Woo-rim for the 2nd round competition and trained him. Then, he selected Bae Doo-hoon for the 3rd round competition to add variety to the team color. In the final competition, Kang Hyung-Ho joined the team. Cho Mingyu and Ko Woo-rim are the only classically-trained singers of the quartet and are alumni of Seoul National University's famed College of Music. Cho had been planning to continue with graduate studies in Germany and was a member of the Seoul Metropolitan Opera for several years¹. Ko was then a third-year undergraduate voice major who had been a finalist and semi-finalist in several vocal competitions. Bae Doo-hoon is a musical actor who had studied acting at the Korea National University of Arts and occasionally sang for Aux, a gugak-rock fusion band. He previously appeared in Hidden Singer and The Voice of Korea prior to auditioning for Phantom Singer. Kang Hyung-ho is the only member without any formal training in either music or the performing arts, although he was the vocalist of an amateur rock band he and some friends had formed as college students. He was a chemical engineer and researcher at Lotte and took a temporary leave of absence to audition, eventually resigning after Forestella debuted. While on Phantom Singer 2, the members already differentiated themselves from other contestants for their willingness to experiment with other genres and for their "adventurous" song selections, a reputation which persists to this day. They have also embarked on a nationwide tour starting in December⁸ and have been featured in numerous performances, including their rendition of 'Bad Romance' by Lady Gaga on the show Immortal Songs 2. Forestella's music continues to captivate global audiences with their unique blend of classical standards, pop covers, and reworkings of traditional Korean music. Their story serves as a testament to the power of passion, dedication, and teamwork in the pursuit of musical excellence.

Source:
(1) Forestella - Wikipedia. https://en.wikipedia.org/wiki/Forestella.
(2) Forestella Members Profile (Updated!) - Kpop Profiles. https://kprofiles.com/forestella-memb....
(3) Forestella Members Profile (Updated Facts!) - Kpop Singers. https://kpopsingers.com/forestella-me....
(4) Quartet Forestella to embark on nationwide tour from December. https://koreajoongangdaily.joins.com/....
(5) Bad Romance - Forestella [Immortal Songs 2] | KBS WORLD TV 220730.    • Bad Romance - Forestella [Immortal So...  .
(6) Forestella Songs, Albums, Reviews, Bio & More | AllMusic. https://www.allmusic.com/artist/fores....
(7) Forestella(포레스텔라) - Lazenca, Save Us (Immortal Songs 2) | KBS WORLD TV 211225.    • Forestella(포레스텔라) - Lazenca, Save Us ...  .
(8) Forestella(포레스텔라) - As I Live(살다가) (Immortal Songs 2) | KBS WORLD TV 211113.    • Forestella(포레스텔라) - As I Live(ᄉ...  .
(9) Forestella - Experience the Magic of Their Captivating Performances.    • Forestella - Experience the Magic of ...  .
(10) Crossover band Forestella aims for Billboard - The Korea Times. https://www.koreatimes.co.kr/www/art/....
(11) Magic Korea Presents: Forestella | Coppell Arts Center. https://www.coppellartscenter.org/eve....
(12) Forestella: albums, songs, playlists | Listen on Deezer. https://www.deezer.com/en/artist/1430....
(13) Forestella 포레스텔라: COMPLETE EDITION - playlist by ... - Spotify. https://open.spotify.com/playlist/6qR....
(14) Forestella | K-pop Wiki | Fandom. https://kpop.fandom.com/id/wiki/Fores....
(15) Forestella Members Profile (Updated!) - Kpop Profiles. https://bing.com/search?q=Forestella+....
(16) Forestella share their secret to success - Korea JoongAng Daily. https://koreajoongangdaily.joins.com/....
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