Giuk
Giuk in January 2022
Born	(2000-01-24) January 24, 2000 (age 25) Suwon, Gyeonggi-do, South Korea
Other names	CyA (키아) (2015–2023)
Education	Hanlim Multi Art School (Dept of Applied Music, graduated Class of 2019)
Occupations	Musician rapper songwriter producer
Musical career
Genres	alternative rock K-pop Korean rock Korean hip hop
Instrument(s)	Vocals, Bass
Years active	2015–present
Labels	RBW KISS Ent. Modern Music
Member of	ONEWE NAMED LATE
Musical artist
Korean name
Hangul	이기욱
Hanja	李寄旭
Revised Romanization	I Giuk
McCune–Reischauer	I Kiuk

Lee Giuk (Korean: 이기욱, born January 24, 2000), known mononymously as Giuk and formerly known by the stage name CyA (Korean: 키아; RR: Kia), 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 (2100)".^[1] His second solo EP Rise Waves was released just seven months later on November 15, 2023, with the lead single "Scratch".^[2]

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Giuk released his first single as a member of the band M.A.S 0094 (now known as Onewe), "Butterfly, Finding Flower", on August 13, 2015, earning his first KOMCA credit at the age of fifteen.^[3][4]

He made his official debut with M.A.S 0094 on The Show on August 2, 2016 with the band's performance of their song "After 15 Seconds".^[5][6]

On December 12, 2016, Giuk featured in the soundtrack "Promise" by Donghyun of Boyfriend for The Miracle OST Part.2.^[7]

On June 1, 2017, RBW Entertainment announced that they had signed an exclusive contract with his band M.A.S 0094, and the band's name was shortened to MAS.^[8]

In October of that year, Giuk participated in the survival show The Unit, auditioning alongside MAS and competing individually. He was eliminated in the 7th episode, placing 59th.^[9]

In June 2018, RBW announced that MAS would rebrand and re-debut under the name "Onewe".^[10]

Giuk produced and featured in "Crazy & Crazy (Prod. CyA)" for labelmate Oneus' debut EP, titled using his former stage name CyA, which was released on January 9, 2019.^[11]

Giuk officially made his re-debut with Onewe on May 13, 2019, with the release of their digital single album titled 1/4.^[12] 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, 2019.^[13][14]

On June 7, 2019, he made his indie debut in Japan under as a member of Onewe with their first Japanese single album Reminisce About All.^[15]

In 2020, he co-wrote, composed and arranged "Dizzy" for Oneus' fourth EP Lived which was released on August 19, 2020.^[16]

In 2021, Giuk co-wrote the lead single "Zombie" for Purple Kiss' second EP Hide & Seek and featured in the music video.^[17][18] 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.^[19][20]

On March 9, 2023, RBW Entertainment announced that Giuk will no longer be using the stage name CyA, and will go by his legal name, Giuk, for all official activities henceforth.^[21] This includes both his activities 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.^[22]

Giuk officially made his solo debut on April 20, 2023, 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.^[23]

He wrote the lyrics and composed for the single "Save Me" for Mamamoo+ which was pre-released on July 18 and included in the duo's first EP Two Rabbits.^[24] He also co-wrote "Mistake" for Purple Kiss which was released in the group's first single album Festa on September 5, 2023.^[25]

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, 2023.^[26]

On November 11, he held a solo concert entitled "Flight1112".^[27]

Giuk returned with his second solo EP Rise Waves, released on November 15, 2023, with the lead single "Scratch".^[2]

Following the military discharge of members Yonghoon and Kanghyun, Onewe returned as a complete five-piece band with their third EP Planet Nine: Isotropy on April 17, 2024, resuming promotions through music broadcasts and various festivals and concerts.^[28]

In addition to his promotions with Onewe throughout the year, Giuk featured in the singles "Back To You" by Aden, released on July 30, 2024, and "You Don't Love Me" by Divine, released on October 2, 2024^[29][30]

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 December 2024, the Korea Music Copyright Association (KOMCA) has 106 songs listed under his name. All credits adapted from KOMCA, unless stated otherwise.^[4]