JEFF
EPEX Member Profile · Main Rap · Maknae
Profile
JEFF is a current member of EPEX under C9 Entertainment. JEFF is EPEX’s main rapper and maknae. He took part in writing and composition work across Youth : Epilogue, including “ECHO,” as EPEX increased its direct creative involvement.
In 2026, JEFF participated in the seven-member era of EPEX, including the seventh EP Youth : Epilogue and the group’s fourth concert project ECHO.
Career Highlights
Youth : Epilogue · ECHO
JEFF took part in EPEX’s seventh EP era as the group completed its long-running “Youth” project.
ECHO concert project
Joined EPEX’s fourth concert activities following the June comeback.
ROMANTIC YOUTH
Participated in the group’s third full-length album and overseas activities.
YOUTH DAYS · YOUTH DEFICIENCY
Promoted major releases including “Youth2Youth” and “UNIVERSE.”
EPEX debut
Debuted with Bipolar Pt.1: Prelude of Anxiety and “Lock Down.”
Official Links & Members’ Shared SNS
News & Further Reading
Korean and international coverage, plus official references. Member-related group reports are labeled accordingly.
June 9, 2026 · Korean News · Hankyung · Korean-language articleJEFF discusses his first songwriting credits ↗Group showcase report including JEFF’s comments.
June 5, 2026 · Korean News · iMBC · Korean-language articleJEFF’s creative process ↗Group production report covering JEFF’s participation.
OfficialJEFF profile · EPEX Japan ↗June 2026 · OfficialYouth : Epilogue discography ↗November 2025 · OfficialC9 statement confirming the seven-member lineup ↗