May 28, 2019-present
Jung Wook Jin (Hangul: 정욱진), known under his stage name as Nine (Hangul: 나인), is a South Korean K-POP Idol under 8D Entertainment. He is the Maknae and Vocalist of OnlyOneOf, and made his debut on May 28th, 2019 with the mini album "OnlyOneOf yOu'.