Kim Joo Hyung, known mononymously as Joohyung, is a South Korean singer, dancer, lyricist, composer, and member of NINE.i (나인아이) under FirstOne Entertainment (퍼스트원 엔터테인먼트). He graduated from Munjeong High School and, before debuting, spent one and a half years as a trainee. He made his debut in 2022 as the group's performance leader with their first mini album, "New World". He is credited as a lyricist and composer in several of their songs. In 2024, all members except Eden are in a legal dispute with their agency for undisclosed reasons.

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