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이펙스

Boy group · C9 Entertainment · since 2021

EPEX

이펙스

C9 Entertainment's boy group that tells its albums in series, from Bipolar to the Youth trilogy. The last chapter, Youth: Epilogue, came out in June 2026 with lyrics by three of the members.

6years on 8 June 2027 · in 227 days

Their story

Eight trainees, eight peaks

EPEX started as C9 Rookies, a working name for eight trainees at C9 Entertainment, the home of CIX. The final name is short for "Eight Apex", each member reaching his own peak. Keum was the familiar face, having come close to the final line-up of Produce X 101. The debut EP Bipolar Pt.1: Prelude of Anxiety arrived in June 2021, with "Lock Down" as its title track.

Albums told in series

From the start EPEX worked in chapters. The Bipolar EPs split into a line about anxiety and a line about love, and the titles kept that split until 2023. Baekseung said the debut songs came out of the members' real conversations. Then came the Youth trilogy, three studio albums in little more than a year, from "Youth2Youth" to "Grateful to Tears". A-Min has said the group wants to keep making series with connected stories.

Hip-hop roots, softer edges

The early records leaned on hip-hop, though the members call themselves a dance group, and they mixed in trap, Latin and R&B. Later singles turned warmer: "Do 4 Me" was funky, "Sunshower" a groovy song about a first break-up. Fans know them for tight choreography, and the press calls them a "performance hotspot". In May 2025 they played Fuzhou, in what was reported as the first K-pop concert in mainland China since 2016.

Where they are now

Keum, who had been on a break since the spring, left when his contract with C9 ended in November 2025. The other seven came back in June 2026 after their longest gap yet with Youth: Epilogue, the end of the Youth story. Jeff, Baekseung and Ayden wrote the lyrics of the title track "ECHO", Wish and A-Min worked on choreography, and Yewang directed the recordings.

Timeline

  1. C9 introduces the eight trainees under the working name C9 Rookies.

  2. Debut with the EP Bipolar Pt.1: Prelude of Anxiety and "Lock Down".

  3. Bipolar Pt.2: Prelude of Love, with the funky "Do 4 Me".

  4. Prelude of Love Chapter 2. 'Growing Pains', with "Sunshower".

  5. First studio album, Youth Chapter 1: Youth Days, opens the Youth series.

  6. Second studio album Youth Chapter 2: Youth Deficiency, with "UNIVERSE".

  7. Third studio album Youth Chapter 3: Romantic Youth, with "Grateful to Tears".

  8. Keum leaves the group as his contract with C9 ends; EPEX continue as seven.

  9. Seventh EP Youth: Epilogue, with "ECHO", closes the series after 11 months away.

  10. 24 October 2026

Start with these 5 songs

  1. Lock DownThe hip-hop debut title track, written around the pandemic.2021
  2. Do 4 MeA funky love confession from their first comeback.2021
  3. SunshowerA groovy song about a first break-up.2023
  4. Youth2YouthTitle track of the first studio album and the start of the Youth series.2024
  5. UNIVERSETitle track of Youth Chapter 2: Youth Deficiency.2024

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In the Fan Chart

The Fan Chart on The Crowd adds up every fan's top 10. Here is where EPEX stands.

    Add EPEX to your setlist

    For ZENITH

    Wish

    곽다윗
    Name
    Kwak Da-wit
    Born
    11 June 2002

    The oldest member; co-created the choreography for "Better Days" on Youth: Epilogue.

    MU

    서경민
    Name
    Suh Kyung-min
    Born
    14 September 2003

    Handled the styling for Youth: Epilogue; started a YouTube channel with Baekseung in 2026.

    A-Min

    조민우
    Name
    Cho Min-woo
    Born
    22 May 2004

    Co-created the "Better Days" choreography with Wish.

    Baekseung

    김현우
    Name
    Kim Hyun-woo
    Born
    5 October 2004

    Said the debut songs grew out of the members' own conversations; co-wrote the lyrics of "ECHO".

    Ayden

    권예준
    Name
    Kwon Ye-jun
    Born
    24 January 2005

    Explained the fan name ZENITH in 2021 as the peak the eight members would reach together.

    Yewang

    서예왕
    Name
    Seo Ye-wang
    Born
    12 March 2005

    Worked as recording director on Youth: Epilogue.

    JeffYoungest member

    이재호
    Name
    Lee Jae-ho
    Born
    21 April 2005

    Co-wrote the lyrics of "ECHO" with Baekseung and Ayden.

    Quick answers

    When did EPEX debut?

    On 8 June 2021, with the EP Bipolar Pt.1: Prelude of Anxiety and the title track "Lock Down".

    How many members does EPEX have?

    Seven: Wish, MU, A-Min, Baekseung, Ayden, Yewang and Jeff. Keum, one of the original eight, left when his contract with C9 ended in November 2025.

    What is the EPEX fandom called?

    ZENITH.

    What does EPEX mean?

    It stands for "Eight Apex": the eight young members at debut each reaching their own peak.

    Is EPEX still active?

    Yes. The seven members released the EP Youth: Epilogue on 9 June 2026, with the title track "ECHO".

    Know your EPEX?Six K-pop questions a day in the Daily, and a collectible card for every finished set.

    Play the Daily

    Last checked 24 October 2026. Sources include Soompi, South China Morning Post, Star News, Sports Khan and Billboard Brasil. Spotted a mistake? Tell us.