• I. Introduction:

    B.D.U (BOYS DEFINE UNIVERSE) is a pre-debut boy group. The members are Seunghun, Bitsaeon, Jay Chang, and Kim Minseo. They are the finalists from Mnet’s project show, ‘Build Up: Vocal Boy Group Survivor‘. The group will be active for two years. The debut is currently unknown.

    • Bitsaeon is a member of M.O.N.T.
      • He is also a former MIXNINE and Peak Time contestant.
    • Seung Hun is a member of CIX.
      • He is also a former YG Treasure Box contestant.
    • Jay Chang is a member of ONE PACT
      • He is also a former Under Nineteen and Boys Planet contestant.
    • Kim Minseo is a former The Origin - A, B, or What? contestant.


    On December 5, 2023, Mnet announced the launch of the survival program Build Up : Vocal Boy Group Survivor slated for 2024 to create a vocal boy group. On December 26, they confirmed the show would premiere on January 26, 2024.

    2024: Debut with Wishpool

    Hunminjaybit emerged as the winner on March 30, 2024, securing a 2-year contract and 100 million won. On June 10, B.D.U announced their debut with the mini album Wishpool set for June 26.

    II. Members:

    Stage Name: Bitsaeon (빛새온)
    Birth Name: Kim Sanyeon (김상연)
    Position: Leader
    Birthday: June 4th, 1995
    Zodiac Sign: Gemini
    Height: 181 cm (5’11”)
    Blood Type: O
    MBTI Type: INFJ
    Nationality: Korean
    Group: M.O.N.T
    Instagram: bitsaeon0604

    Bitsaeon’s stage name means “new and strong light”.
    If he wasn’t an idol, he would have
    want to become a vocal teacher.
    He can sing in various languages
    (English, Hebrew, Swedish, Norwegian,
    Spanish, and more).
    He enlisted in the military on November 30th, 2020.
    He was discharged on May 29th, 2022.
    Stage Name: Seunghun (승훈)
    Birth Name: Kim Seunghun (김승훈)
    English Name: Marc Kim
    Position: –
    Birthday: February 26th, 1999
    Zodiac Sign: Pisces
    Height: 182 cm (5’11”)
    Blood Type: AB
    MBTI Type: ENFP
    Nationality: Korean
    Group: CIX

    He was born in Cheongju, North Chungcheong,
    South Korea.
    He used to train in YG and Cube.
    Training period: 9 years.
    He participated in survival show Stray Kids
    and YG Treasure Box
    In YG Treasure Box, he got eliminated in episode 9
    but was brought back to for the finals.
    Unfortunately, Seunghun didn’t make it to
    the final line-up.
    He was the 2nd member to be revealed for CIX.
    Stage Name: Jay Chang (제이창)
    Position: –
    Birthday: March 8th, 2001
    Zodiac Sign: Pisces
    Height: 175 cm (5’9″)
    Blood Type: O
    MBTI Type: INFP
    Nationality: American
    Group: ONE PACT
    Instagram: jaychang63
    Twitter: jchang63
    YouTube: Jay Chang

    Jay Chang is from New Jersey, USA.
    His mom is Filipino-Chinese and his
    dad is Irish-Hungarian. (TikTok)
    His dad is his inspiration.
    He mainly listens to early 2000-2010 rock music.
    Stage / Birth Name: Kim Minseo (김민서)
    Position: Maknae
    Birthday: January 11th, 2003
    Zodiac Sign: Capricorn
    Height: –
    Blood Type: –
    MBTI Type: –
    Nationality: Korean
    Instagram: minseo_ale

    He was a contestant on the survival show
    The Origin – A, B, or What?, and got eliminated in episode 8.
    Can speak Korean, Chinese, and English.
    He has spent 10 years in China when he was younger.
    Hhas attended an international school
    which is why he’s so fluent in English.

    III. Discography:

    • Mini albums
      • Wishpool (2024)
    • Participation releases
      • Build Up : Vocal Boy Group Survival, Semi Final ("Flower") (2024)
      • Build Up : Vocal Boy Group Survival, Final ("Hold Me") (2024)
      • 빌드업 스페셜 (with WATERFIRE & The Partners) (2024)

    IV. Concerts:

    World tours

    • Tour for Wishpool: Flash & Light (2024)

    V. Filmography:

    Survival shows

    • Build Up : Vocal Boy Group Survivor (Mnet, 2024)