Giuk

Lee Giuk (, born January 24, 2000), known mononymously as Giuk and formerly known by the stage name CyA , is a South Korean musician, rapper, songwriter, and producer. He is the bassist and rapper of the South Korean alternative rock band Onewe (formerly known as M.A.S 0094 or MAS). He made his solo debut on April 20, 2023, releasing his first extended play (EP) Psycho Xybernetics : Turn Over with the lead single "Time Machine". His second solo EP Rise Waves was released seven months later on November 15, 2023, with the lead single "Scratch".

Career 2015-2016: M.A.S 0094 formation and debut In 2015, Giuk formed the band M.A.S 0094 with his four bandmates and they originally performed cover songs. He got his first writing credit through KOMCA on the band's first original single, "Butterfly, Finding Flower", released on August 13. He would continue to participate in the band's songwriting, and also started composing songs, with the singles "Feeling Good" and "Starlight."

On December 12, Giuk featured in the soundtrack "Promise" by Donghyun of Boyfriend for The Miracle OST Part.2.

2017-2018: MAS, The Unit and rebrand as Onewe On June 1, 2017, he signed with RBW Entertainment as part of M.A.S 0094, and the band's name was shortened to MAS. In October, Giuk participated in the survival show The Unit, auditioning with the other members of MAS, but they competed individually. He was eliminated in the 7th episode, placing 59th.

As a member of MAS, Giuk used the stage name CyA, and he continued to use this name when MAS re-branded and re-debuted under the name "Onewe" in June 2018.

2019-present: Re-debut with Onewe and other producing activities Giuk produced and featured in "Crazy & Crazy (Prod. CyA)" for labelmate Oneus' debut EP Light Us which was released on January 9, 2019.

Giuk officially made his re-debut with Onewe on May 13, with the release of their digital single album titled 1/4. Giuk took lead on writing and composing the song "Ring on my Ears" for the album, for which a music video was released on May 15. He then made his debut in Japan as a member of Onewe with their first Japanese single album Reminisce About All on June 7.

While continuing to participate in Onewe, Giuk also continued to write music for other groups. In 2020, he co-wrote, composed and arranged "Dizzy" for Oneus' fourth EP Lived which was released on August 19. In 2021, Giuk he co-wrote the lead single "Zombie" for Purple Kiss' second EP Hide & Seek and featured in the music video. He also acted in a main role alongside Purple Kiss member Goeun in the group's story films for the promotion of their following EP.

2023: Solo debut with Psycho Xybernetics : Turn Over, Rise Waves On March 9, 2023, RBW Entertainment announced that Giuk will no longer use the stage name CyA, and now uses his legal name, Giuk, for all official activities, including as a member of Onewe and his solo activities as an artist and producer.

On April 8 and 9, Giuk held his first solo concert Prologue: Turn Over in anticipation of his solo debut. Giuk officially made his solo debut on April 20, releasing his first EP Psycho Xybernetics: Turn Over with the lead single "Time Machine (2100)". On June 6, he held an encore concert Epilogue: Turn Over.

He wrote the lyrics and composed for the single "Save Me" for Mamamoo+ which was released on July 18 and included in the duo's first EP Two Rabbits released in August. He also co-wrote another song for labelmates Purple Kiss, titled "Mistake", and released in September as part of the group's first single album Festa. Giuk is the featured artist for the title track "A Girl's Panorama" from YongYong's first full-length album MyMy which was released on November 9.

On November 11, he held a solo concert entitled "Flight1112". Giuk released his second solo EP Rise Waves on November 15, with the lead single "Scratch". In addition to his promotions with Onewe throughout the year, Giuk featured in the singles "Back To You" by Aden, released on July 30, and "You Don't Love Me" by Divine, released on October 2, 2024. He is also featured on Divine's "You & Me" released on February 12, 2026.

Discography

Extended Plays TitleEP detailsPeak chart positionsPhysical salesKOR Psycho Xybernetics: Turn Over Released: January 28, 2023 Label: RBW Label: RBW

Singles

As lead artist TitleYearPeak chart positionsAlbumKORDL "Time Machine (2100)" (제0호선 시간역행)2023 —Psycho Xybernetics : Turn Over"Scratch" (내 영혼에 낸 Scratch)179Rise Waves"—" denotes releases that did not chart or were not released in that region.

As featured artist

Soundtrack appearances

As featured artist TitleYearAlbum"Promise" 2016The Miracle OST Part.2

Filmography

Television shows YearTitleRoleNotesRef.2017The Unit: Idol Rebooting ProjectContestantEpisode 1-7

Radio shows Every 3 weeks from December 10, 2020 - October 14, 2021

Participating albums and Sound sources

Music production credits Giuk is the main writer and composer for his solo releases and co-writes/produces the vast majority of Onewe's output alongside the other members, as well a writing and producing for other artists. As of August, 2026, the Korea Music Copyright Association (KOMCA) has 138 songs listed under his name. All credits adapted from KOMCA, unless stated otherwise. +KeyIndicates single release (feat. Hwasa)3/4Kim JaehyunJeon Dawoon, Yonghoon, Kim Jaehyun, Noden"Crazy Good" (미쳤다 미쳤어)OneYonghoonJeon Dawoon, Yonghoon"End Of Spring" (나의 계절 봄은 끝났다)Kim Dohoon, Seo YongbaeKim Dohoon, Seo Yongbae, Jeon Dawoon"If"YonghoonYonghoon, Jeon Dawoon"End of Spring (Rock Ver.)" (나의 계절 봄은 끝났다)Kim Dohoon, Seo YongbaeKim Dohoon, Seo Yongbae, Jeon Dawoon, Kanghyun"About Her" (그녀는 대체)Was It Love? OST Part.6JTBC StudiosHa Geunyoung, Lee Suyeon, Lee Jinsil, Yonghoon"Dizzy" (혼란하다 혼란해)OneusLivedRBW EntertainmentSeoho, RavnSeoho, Ravn, CocoDoobooPapa"Parting" (소행성)OneweStudio We : RecordingKanghyunKanghyun, Jeon Dawoon, Harin"Regulus (Melody Guide 2)" (야행성)Kanghyun, HEUNGEULKanghyun"Parting (Prologue Mix)" (소행성)KanghyunKanghyun"Love Me" (내가 처음 만져본 강아지)Yonghoon"0&4 (Dialogue Rough)" (공과 사)Kanghyun, Yonghoon"Crazy Good (Rock Vibes)" (미쳤다 미쳤어)YonghoonYonghoon"If (181125_2)"YonghoonYonghoon, Jeon Dawoon"Trauma (Aquarium)"Memory : IllusionYonghoonYonghoon, CocoDoobooPapa, Kanghyun, Harin"A Book in Memory" (기억 속 한 권의 책)YonghoonYonghoon, Jeon Dawoon"Eraser" (기억 세탁소)Jeon Dawoon, YonghoonJeon Dawoon2021"Intro: Spaceship" (Intro : 우주선)Planet Nine : Alter EgoKanghyun, Harin"Rain To Be" (비를 몰고 오는 소년)KanghyunKanghyun, Jeon Dawoon"Aurora"Kanghyun, Yonghoon"Logo"Yonghoon, Harin, DongmyeongYonghoon, Kanghyun, CocoDoobooPapa"A.I." (로보트도 인간에게 감정을 느낀다)Yonghoon, DongmyeongYonghoon, Jeon Dawoon, Kanghyun"Veronica" (베로니카의 섬)YonghoonYonghoon, Kanghyun, Jeon Dawoon"Cosmos" (천체)Kanghyun"Zombie"Purple KissHide & SeekKim Dohoon, Kang Jiwon, Basick, Yuki"Star" (별)OneweStudio We : Recording #2Jeon Dawoon, CocoDoobooPapa, YonghoonJeon Dawoon, CocoDoobooPapa, Yonghoon"Aurora (191128_2)"Kanghyun, Yonghoon, Jeon Dawoon"Logo (First Live Ver.)"YonghoonYonghoon, Kanghyun"A.I. (Guitar Rough)" (로보트도 인간에게 감정을 느낀다)YonghoonYonghoon"Veronica (Draft Guide)" (베로니카의 섬)YonghoonYonghoon, Kanghyun"Rain To Be (Original Topline Ver.)" (비를 몰고 오는 소년)Kanghyun"Cosmos (Cosmos Guitar Vibe)" (천체)Kanghyun"Aquarium (Trauma Ver.)""In Course"Kanghyun, Harin2022"Envision_" (우물 속 작은 아이)Planet Nine : VoyagerHarinHarin, Yonghoon, CocoDoobooPapa"Montage_" (꿈속에서 놓친 너, 옅은 잠결에 흐르길)YonghoonYonghoon, Jeon Dawoon, CocoDoobooPapa"Trigger_" (시발점)Dongmyeong"Orbit_" (궤도)KanghyunKanghyun, Jeon Dawoon, CocoDoobooPapa"From_" (선물할게요)"Roommate"TimelessYonghoon, Im Dohwan"Starlight (Live Ver.)"Jeon Dawoon, Onewe"Hippie (Freedom from MM)" (히피)Great Seoul Invasion Section 1MPMG MusicYonghoonOnewe, Jeon Dawoon"Envision_ (Ani Vibe Ver.)" (우물 속 작은 아이)Studio We : Recording #3RBW EntertainmentHarinHarin"Montage_ (210810)" (꿈속에서 놓친 너, 옅은 잠결에 흐르길)YonghoonYonghoon"Trigger_ (201007) (시발점)Dongmyeong"Orbit_ (Piano Ver)" (궤도)Kanghyun2023"Gravity"GravityYonghoon, Lee JooHee(MUMW), se.on(MUMW), Young(MUMW)Yonghoon, Jeon Dawoon"AuRoRa" (English Ver.)Kanghyun, Yonghoon, Lee Joo Hee(MUMW), Bisom(MUMW)"Parting" (English Ver.)Kanghyun, Lee Joo Hee(MUMW), ReMi(MUMW)Kanghyun, Jeon Dawoon, Harin"Regulus" (English Ver.)Kanghyun, HEUNGEUL, Lee Joo Hee(MUMW), Im Hye Rin(MUMW)Kanghyun, Jeon Dawoon"Montage_" (English Ver.)Yonghoon, Lee Joo Hee(MUMW), Kim Eung Ju(MUMW)Yonghoon, Jeon Dawoon, CocoDoobooPapa"Rain To Be" (English Ver.)Kanghyun, Lee Joo Hee(MUMW), Seo Ha Mi(MUMW)Kanghyun, Jeon Dawoon"Ring on my Ears" (English Ver.)Lee Joo Hee(MUMW), ReMi(MUMW)Jeon Dawoon, Kanghyun"Trauma" (English Ver.)Yonghoon, Lee Joo Hee(MUMW), LEESIDAE(MUMW)Yonghoon, CocoDoobooPapa, Kanghyun, Harin"Logo" (English Ver.)Yonghoon, Harin, Dongmyeong, Lee Joo Hee(MUMW), Bisom(MUMW)Yonghoon, Kanghyun, CocoDoobooPapaEnd Of Spring (English Ver.)Kim Dohoon, Seo Yongbae, ESSIEKim Dohoon, Seo Yongbae, Jeon Dawoon"Crazy Good" (English Ver.)Yonghoon, Lee Joo Hee(MUMW), roze(MUMW)Jeon Dawoon, Yonghoon"Zombie (Japanese ver.)"Purple KissDear VioletKim Dohoon, Kang Jiwon, Basick, Yuki, Davve"Intro : X" (새 지구)GiukPsycho Xybernetics : Turn Over"Time Machine (2100)" (제0호선 시간역행)Jeon Dawoon"Unblown (2020)" (꽃에 물 안 주고 피길 원하네) (feat. Aden)AdenJeon Dawoon, Aden, Gray Dot"Ego (2021)" (자기중심적) (feat. NiiHWA)NiiHWA, KauhaxiJin Minho, NiiHWA, Kauhaxi"Love Virus❤ (2050)" (feat. Sunwoo)SunwooSunwoo, LIVING PUFF"Rarity (2062)" (멸종 위기종)Jeon Dawoon, Gray Dot"Xybernetic (2077)" (feat. Kami)KAMIKAMI"Apocalypse (2090)"YHK, Gray Dot"Save Me" (지구에 혼자 남게 된다면 (..*---*..))Mamamoo+Two RabbitsMoonbyulJeon Dawoon, Moobyul"Salty Boy"OneweXOXODongmyeongDongmyeong, Jeon Dawoon"Omnipresent" (동서님복)Harin, CocoDoobooPapa"Mistake"Purple KissFestaAllThou, KINSHA, FLORA"A Girl's Panorama" (소녀의 파노라마) (feat. Giuk)YongYongMyMySaurusYongYongYongYong, Heondred"Intro : Foreverest" (Intro : 영원의 숲)GiukRise WavesRBW EntertainmentGray Dot"Scratch" (내 영혼에 낸 Scratch)Jeon Dawoon"Block123" (보도블록123) (feat. Moonbyul of Mamamoo)CocoDoobooPapaCocoDoobooPapa"Overtake" (추월)Jeon Dawoon, mediumrarecookies, 8:59"Happy or Not?" (feat. Rare, Gray Dot)Gray Dot, RareGray Dot, Rare"Penrose Stairs" (feat. YongYong, Leedo of Oneus)YongYong, LeedoYongYong, Leedo"My Blue"Gray Dot"Outro : Dresden" (Outro : 한 소녀의 촛불)KauhaxiKauhaxi"We Wish You A Merry Christmas"OneweNon-album singleDongmyeongDongmyeong2024"Beautiful Ashes" (추억의 소각장)Planet Nine: IsotropyYonghoonJeon Dawoon, Yonghoon, Kanghyun, Harin"Shoot It Out"Kanghyun"Meteor Shower" (한여름 밤 유성우)Gray Dot"Count The Stars" (별 세는 너)Yonghoon"Kiss in the Rain"DongmyeongJeon Dawoon, Dongmyeong, CocoDoobooPapa"Pleasant" (다시 만나서 반가워)Harin, Yonghoon"Back To You" (오늘 또 내일) (feat. Giuk)AdenMARO RecordsAdenAden, RUIMUI"Off Road"OneweOff RoadRBW EntertainmentDr.Jo"Solar Halo Ring"Bydor ArchiveKanghyun, Gray Dot, Bydor Archive"A Piece of You"Yonghoon"You Don't Love Me" (틀린 말없이) (feat. Giuk)DivineDivineDivine, Checkmate"We X Mas" (크리스마스는 이래야지)OneweSecret SantaRBW EntertainmentDongmyeong, HarinDongmyeong, Harin, Jeon Dawoon"Actor"Jeon Dawoon, YonghoonJeon Dawoon, Yonghoon, Kanghyun, Harin2025"Alice"We: Dream ChaserKanghyun"The Starry Night" (별 헤는 밤)Kanghyun"Evildoer" (악당은 영웅의 변신을 기다려준다)Bydor Archive, JxhyungJxhyung, Bydor Archive"Traffic Love" (일방통행; 一方通行)Bydor ArchiveBydor Archive, wez"Rise Again" (오래된 음악가의 추억)Harin"Dreamcatcher" (청천을; 靑天乙)Bydor ArchiveGray Dot, Bydor Archive"All the things I love" (눈이 부시게)Dongmyeong"Sole Star" (검은 별)Bydor ArchiveBydor Archive, wez, Gu Ye-eun"Lighthouse""Where's my hero? Special OST Part.3"Page !, Jeon Dawoon, Harin, Kanghyun"Zombie (English ver.)"Purple KissOur NowKim Dohoon, Kang Jiwon, Basick, Yuki, eSNa"Maze" (미로)OneweMaze: Ad AstraBydor ArchiveBydor Archive, wez"Hide & Seek" (숨바꼭질)Bydor ArchiveJxhyung, Bydor Archive"Trace" (흔적)Harin"Beyond the Storm" (비바람을 건너)Dongmyeong, X3RO2026"Ferris wheel" (관람차)Studio We: Recording #4Bydor ArchiveHashin, Bydor Archive"Meteor Shower" (한여름 밤 유성우) (7.29)"Dreamcatcher" (청천을) (2021)"Rise Again" (오래된 음악가의 추억) (Nostalgia Demo Ver.)Harin"Solar Halo Ring" (바다에 적신 햇무리 반지) (Wedding Ver.)Bydor ArchiveKanghyun, Gray Dot, Bydor Archive"You & Me" (너 하고 나) (feat. Giuk)DivineDivineDivine"Coordinates" (좌표)Onewe點: The QuiverRBW EntertainmentKanghyun, Bydor Archive"Compass" (나침반)Bydor ArchiveBydor Archive, wez"Icarus"Kanghyun, Bydor Archive"Fly"Dongmyeong, Bydor ArchiveDongmyeong, Bydor Archive, wez"Neverland" (우리들은 행방불명)線: The WakeBydor ArchiveBydor Archive, Kanghyun, wez"Scenario" (우리들은 행방불명)面: Unknown AtlasX3RO, Harin"Tinker Bell" (피크요정)Bydor Archive, KanghyunGray Dot, Bydor Archive"Fairy Tale" (동화)Kanghyun"Lilliput" (소인국)Kanghyun, Bydor Archive"Laputa" (피크요정)Kanghyun, Bydor Archive"Pinocchio" (피투성이 피노키오)Bydor ArchiveBydor Archive, wez, Choi Min-ho"Imposter"Harin

Music video production credits YearSongArtistAlbumCreditedRef2023"Love Virus♥ (2050)" (feat. Sunwoo)GiukPsycho Xybernetics : Turn OverCo-director