ArtistC9 Entertainment
Jeff
Jeff is part of EPEX, the C9 Entertainment boy group that has kept a rare sense of continuity across multiple full-length releases. He debuted with the group on June 8, 2021 under C9 Entertainment and has stayed in the frame as EPEX moved from its debut anxiety-era material into the longer Youth rollout. In April 2026, the group confirmed Youth : Epilogue for a June release, positioning the seventh EP as the final chapter of the current series. That places Jeff inside the part of EPEX's catalog that has done the most to sharpen the group's identity.
0 articles4 creditsDebut: June 8, 2021South Korean
Gallery
Discography
2026
Youth : EpilogueEP
2025
Youth Chapter 3 : ROMANTIC YOUTHAlbum
2024
Youth Chapter 2 : YOUTH DEFICIENCYAlbum
2024
Youth Chapter 1 : YOUTH DAYSAlbum
Fans Also Ask
Who is Jeff in EPEX?
Jeff is a member of <a href="/artists/epex">EPEX</a>, the C9 Entertainment boy group that debuted in 2021. He is part of the lineup carrying the group through its Youth-era releases, including the 2026 comeback project <em>Youth : Epilogue</em>.
When did Jeff debut with EPEX?
Jeff debuted with <a href="/artists/epex">EPEX</a> on June 8, 2021, when the group launched under <a href="/brands/c9-entertainment">C9 Entertainment</a>. Since then he has been part of the group’s run from the <em>BIPOLAR</em> debut era into the multi-album Youth series.
What does Jeff do in EPEX?
Jeff is credited within EPEX as main rapper, maknae. On HITKULTR, that places him inside the group’s current Youth-era arc, from <em>Youth Chapter 1 : YOUTH DAYS</em> through the new <em>Youth : Epilogue</em> comeback cycle.
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