BOYNEXTDOOR is a six-member South Korean boy group under KOZ Entertainment, the agency founded by ZICO. The group consists of Sungho, Riwoo, Jaehyun, Taesan, Leehan, and Woonhak.
The group officially debuted on May 30, 2023, with their first single album WHO!. BOYNEXTDOOR has developed an identity around approachable music, relatable stories, and the everyday emotions of youth.
The group’s name means “the boys next door,” reflecting their friendly and familiar image. KOZ Entertainment describes BOYNEXTDOOR as a group that focuses on telling stories about everyday life and the emotions experienced by young people
BOYNEXTDOOR Members
| Member | Birthday | Nationality |
|---|---|---|
| Sungho | September 4, 2003 | Korean |
| Riwoo | October 22, 2003 | Korean |
| Jaehyun | December 4, 2003 | Korean |
| Taesan | August 10, 2004 | Korean |
| Leehan | October 20, 2004 | Korean |
| Woonhak | November 29, 2006 | Korean |
KOZ Entertainment’s official profile confirms the six-member lineup and birth dates.
BOYNEXTDOOR Sungho Profile
Stage Name: Sungho
Birth Name: Kim Sungho
Birthday: September 4, 2003
Nationality: Korean
Position: Vocalist
Sungho is the oldest member of BOYNEXTDOOR. He is known for his vocals, visuals, and calm personality.
As the group’s oldest member, Sungho often brings a dependable presence to the team. He participates in BOYNEXTDOOR’s performances and group activities alongside the other members.
BOYNEXTDOOR Riwoo Profile
Stage Name: Riwoo
Birth Name: Lee Sanghyeok
Birthday: October 22, 2003
Nationality: Korean
Position: Dancer, vocalist
Riwoo is known for his dancing and performance skills. He trained as a dancer before becoming a member of BOYNEXTDOOR and has developed a reputation for his clean and controlled movements.
His performance ability is an important part of the group’s choreography and live stages.
BOYNEXTDOOR Jaehyun Profile
Stage Name: Jaehyun
Birth Name: Myung Jaehyun
Birthday: December 4, 2003
Nationality: Korean
Position: Leader, vocalist, rapper
Jaehyun is the leader of BOYNEXTDOOR and one of the members heavily involved in the group’s music.
He has participated in songwriting and production and is known for his energetic personality. Jaehyun’s involvement in the group’s music has continued to grow throughout BOYNEXTDOOR’s releases.
BOYNEXTDOOR Taesan Profile
Stage Name: Taesan
Birth Name: Han Taesan
Birthday: August 10, 2004
Nationality: Korean
Position: Vocalist, rapper, songwriter
Taesan is one of BOYNEXTDOOR’s members involved in songwriting and music production.
He is known for his distinctive voice, musical interests, and contributions to the group’s creative process. KOZ’s official discography credits Taesan on multiple BOYNEXTDOOR releases.
BOYNEXTDOOR Leehan Profile
Stage Name: Leehan
Birth Name: Kim Donghyun
Birthday: October 20, 2004
Nationality: Korean
Position: Vocalist
Leehan is one of BOYNEXTDOOR’s vocalists and is known for his gentle personality and distinctive visual style.
He is also known for his interest in aquatic life and fish, which has become one of his recognizable personal interests among fans.
Leehan has also begun participating in the group’s songwriting process, with KOZ’s official The Action credits listing him alongside Jaehyun, Taesan, and Woonhak.
BOYNEXTDOOR Woonhak Profile
Stage Name: Woonhak
Birth Name: Kim Woonhak
Birthday: November 29, 2006
Nationality: Korean
Position: Rapper, vocalist
Woonhak is the youngest member, or maknae, of BOYNEXTDOOR.
Despite being the youngest, he has been involved in the group’s songwriting and production. He has participated in the creation of several BOYNEXTDOOR songs alongside Jaehyun and Taesan.
BOYNEXTDOOR Debut
BOYNEXTDOOR officially debuted on May 30, 2023, with their first single album, WHO!.
The debut release introduced the group’s approach to storytelling through music, focusing on the emotions surrounding first love, attraction, uncertainty, and confession.
The album included:
- “But I Like You”
- “One and Only”
- “Serenade”
KOZ Entertainment described WHO! as a release centered around the excitement and confusion of falling in love for the first time.
What Does BOYNEXTDOOR Mean?
The name BOYNEXTDOOR literally refers to “the boys next door.”
The name represents the group’s approachable and familiar image. Rather than presenting themselves as distant celebrities, BOYNEXTDOOR focuses on stories and emotions that listeners can relate to.
Their music frequently explores everyday experiences involving friendship, love, heartbreak, youth, and growing up.
BOYNEXTDOOR Music
BOYNEXTDOOR’s music combines pop, hip-hop, R&B, rock, and other influences while maintaining a focus on relatable storytelling.
The group’s official discography currently includes:
- WHO! — 1st Single
- WHY.. — 1st EP
- HOW? — 2nd EP
- 19.99 — 3rd EP
- IF I SAY, I LOVE YOU — 1st Digital Single
- No Genre — 4th EP
- The Action — 5th EP
- HOME — 1st Studio Album
WHO!
BOYNEXTDOOR’s debut single album WHO! introduced the group’s youthful storytelling through three songs about falling in love and confessing feelings.
WHY..
Their first EP WHY.. continued the story from their debut, moving from the excitement of falling in love toward confusion, heartbreak, and the complicated emotions of youth.
19.99
The third EP 19.99 explored the period between adolescence and adulthood.
The album used “19.99” as a metaphor for being on the edge of turning 20 and included songs about growing up, relationships, independence, and uncertainty.
No Genre
With No Genre, BOYNEXTDOOR emphasized their desire not to be restricted by a particular musical style.
The members participated in writing and composing several songs, including the title track “I Feel Good.”
The Action
Their fifth EP The Action continued the group’s focus on growth and trying new things.
The album includes the title track “Hollywood Action” and features songwriting contributions from Jaehyun, Taesan, Leehan, and Woonhak.
HOME
HOME is BOYNEXTDOOR’s first studio album.
The album marks another step in the group’s development, with all six members credited on the album for the first time. The album explores personal stories and the members’ experiences from their trainee days through their journey as artists.
BOYNEXTDOOR Fandom
BOYNEXTDOOR’s official fandom name is ONEDOOR.
The name represents the connection between BOYNEXTDOOR and their fans, with fans serving as the “door” through which the group can connect with the wider world.
KOZ Entertainment also uses ONEDOOR as the official name for BOYNEXTDOOR’s fan community.
BOYNEXTDOOR Quick Facts
| Detail | Information |
|---|---|
| Group | BOYNEXTDOOR |
| Members | 6 |
| Agency | KOZ Entertainment |
| Debut | May 30, 2023 |
| Fandom | ONEDOOR |
| Leader | Jaehyun |
| Oldest Member | Sungho |
| Youngest Member | Woonhak |
| First Release | WHO! |
| First Studio Album | HOME |
Frequently Asked Questions
How many members does BOYNEXTDOOR have?
BOYNEXTDOOR has six members: Sungho, Riwoo, Jaehyun, Taesan, Leehan, and Woonhak.
Who is the leader of BOYNEXTDOOR?
Jaehyun is the leader of BOYNEXTDOOR.
Who is the youngest BOYNEXTDOOR member?
Woonhak is the youngest member of the group.
Who is the oldest BOYNEXTDOOR member?
Sungho is the oldest member.
What is BOYNEXTDOOR’s fandom name?
BOYNEXTDOOR’s fandom is called ONEDOOR.
When did BOYNEXTDOOR debut?
BOYNEXTDOOR debuted on May 30, 2023, with their first single album WHO!.
What agency is BOYNEXTDOOR under?
BOYNEXTDOOR is under KOZ Entertainment.
What type of music does BOYNEXTDOOR make?
BOYNEXTDOOR’s music incorporates pop, hip-hop, R&B, rock, and other genres while focusing heavily on relatable stories about youth and everyday emotions.
BOYNEXTDOOR in 2026
BOYNEXTDOOR continues to expand its discography and musical identity in 2026.
The group released its fifth EP The Action and its first studio album HOME, with the members becoming increasingly involved in songwriting and production. KOZ Entertainment’s official discography shows contributions from Jaehyun, Taesan, Woonhak, and Leehan across the group’s more recent music.
BOYNEXTDOOR’s growth from their 2023 debut to their first full-length album shows the group’s continuing development as performers and songwriters.
Final Thoughts
BOYNEXTDOOR has established its identity through relatable storytelling, youthful energy, and music that reflects everyday experiences.
With Sungho, Riwoo, Jaehyun, Taesan, Leehan, and Woonhak, the six-member group continues to develop its sound while becoming increasingly involved in the creation of its music.
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