KJRGL (KAJA) Members Profile 2026: Bio, Age, Height & interesting facts
The K-pop industry has witnessed countless global collaborations, but few have generated as much intrigue as KJRGL (카자그루)-a six-member Japanese-Korean boy group born from an unprecedented partnership between Sony Music Japan and Sony Music Korea. Debuting in September 2024, KJRGL represents a new era of cross-border idol projects, blending the polished production of K-pop with the artistic sensibilities of J-pop.
KJRGL is a six-member Japanese-Korean boy group jointly managed by Sony Music Japan and Sony Music Korea. Debuted on September 18, 2024, the group consists of Kouki, Akira, Riku, Hojin (formerly Dien), Saeron, and Isaac. Their name means “Kind (of) Just Right Good Luck” and combines the Japanese and Korean words for whale. The group rebranded to KAJA in October 2025. Their official fandom name is VOISEA.
What makes KJRGL particularly compelling is the journey of its members. Every single member of this group carries a story of perseverance-from survival show eliminations to years of uncertain trainee life. Kouki placed 21st on Produce 101 Japan Season 2, just missing debut. Riku and Dien competed on Mnet’s Boys Planet alongside future ZEROBASEONE members. Akira emerged from Sony Music’s prestigious “TORA PROJECT.” Saeron, the son of legendary Korean singer Han Seo-kyeong, chose to forge his own path rather than rely on his mother’s fame. And Isaac, a Malaysian-born trainee, spent years in the Korean training system before finally finding his place.
The group’s name itself carries layered meaning. According to Sony Music Japan, KJRGL stands for “Kind (of) Just Right Good Luck”. But it also combines the Japanese word kujira (whale) with the Korean word golae (whale), representing a creature rising from the deep sea to find its voice. This “whale concept” runs through their entire discography-a story of emerging from darkness into light.
On 2026, KJRGL has rebranded to KAJA (meaning “Let’s go!” in Korean), signaling their evolution and determination to move forward with their fans. Yet for fans and researchers alike, understanding the group requires a deep dive into each member’s individual story. This comprehensive KJRGL members profile 2026 guide covers everything from their biographies and career trajectories to their net worth and fascinating behind-the-scenes facts.
Quick Facts Table
Table of Contents
Who Is KJRGL?
KJRGL is a six-member boy group formed through a joint venture between Sony Music Japan and Sony Music Entertainment Korea. The group consists of three Japanese members-Kouki, Akira, and Riku-and three Korean members-Dien (now Hojin), Saeron, and Isaac. One of the Korean members (Isaac) holds U.S. citizenship, adding another layer of international flavor to the group.
The group’s concept revolves around the metaphor of whales emerging from the deep sea-a narrative of finding one’s voice after struggling in darkness. This “ocean trilogy” began with their pre-debut single “Prologue~The Deepest Blue,” followed by the debut single “Overture~The Blue Wave,” and continued with their first EP “Prelude~The Brilliant Blue”.
KJRGL’s significance in the K-pop industry lies in its unique cross-border structure. While many groups feature foreign members, KJRGL was designed from the ground up as a true Japan-Korea collaboration, with equal representation from both countries and joint management by both Sony divisions. This structure allows them to promote seamlessly in both the Korean and Japanese markets-a strategic advantage that few groups possess.
Group History
Formation and Pre-Debut
The seeds of KJRGL were planted through a unique television program called “Bokutachi, Debut Dekiru ka na?” (Can We Debut?), a documentary-style variety show produced in collaboration with Yoshimoto Kogyo, Sony Music Labels, and Sony Music Entertainment Korea. The show followed trainees as they worked toward debut, capturing their struggles, growth, and determination.
James Im of Sony Music Entertainment Korea, who now manages the group, joined SMEK in June 2022 and was tasked with overseeing this ambitious project. The COVID-19 pandemic initially complicated plans, as Korean trainees faced visa issues, but the project ultimately came together with a perfect six-member lineup.
Official Debut
KJRGL made their official debut on September 18, 2024, with the digital single “OvertureThe Blue Wave”. Prior to this, they released a pre-debut track, “PrologueThe Deepest Blue,” on September 4, 2024. Their first EP, “Prelude~The Brilliant Blue,” followed on November 27, 2024, featuring eight tracks including the lead single “Beautiful Dream” and multiple versions of their debut track.
Breakthrough Success
The group’s debut year was marked by their first live concert, “KJRGlad to sea you!!” held at Spotify O-WEST in Tokyo’s Shibuya district on December 23, 2024. The concert represented a major milestone-six young men who had faced rejection and uncertainty finally standing on stage as debuted artists.
In January 2025, they released their second digital single, “Generation_Cloud,” continuing their aquatic concept. Their first mini-album, “Cloud_Six,” followed on April 23, 2025.
Recent Activities (2025–2026)
In a significant development, KJRGL announced a group name change to KAJA (카자) effective October 2025, revealed during their first-anniversary event on September 18, 2025. The new name means “Let’s go!” in Korean and represents the group’s commitment to evolving alongside their fans. Member Dien also changed his stage name to Hojin as part of the rebranding.
The group released their fifth digital single in January 2026 under their new name. On 2026, KAJA (formerly KJRGL) continues to build their discography and expand their global presence.
Agency and Management
KJRGL is jointly managed by Sony Music Labels Inc. (Japan) and Sony Music Entertainment Korea (South Korea). This dual-management structure is relatively rare in the K-pop industry and reflects the group’s unique cross-border positioning.
Sony Music Entertainment Korea (SMEK) handles the group’s Korean promotions, while Sony Music Labels (SML) manages their Japanese activities. The group is represented by James Im, who has been with SMEK since June 2022 and previously worked with artists including MONSTA X’s I.M.
The group’s trainee contracts and debut details have not been publicly disclosed. However, all members underwent extensive training periods ranging from several months to multiple years before debut.
Member Profiles
Kouki (코우키) Profile
Personal Information
Group Role
| Category | Details |
|---|---|
| Position(s) | Vocalist |
| Representative Emoji | Not officially used |
| Training Period | Since at least 2021 |
Early Life and Education
Sakamoto Kouki was born on January 9, 2001, in Chiba Prefecture, Japan. Growing up in the Greater Tokyo area, Kouki developed an early passion for music and performance. His journey into the entertainment industry began when he decided to audition for one of Japan’s most competitive survival shows.
Career Journey
Pre-Debut Activities:
Kouki’s career trajectory took a dramatic turn in 2021 when he was revealed as a contestant on PRODUCE 101 JAPAN SEASON 2 on January 30. The show, which aimed to form a new boy group, featured 101 trainees competing for a debut spot.
Throughout the competition, Kouki demonstrated his vocal abilities across multiple performances. His team assignments included:
- Audition Team: Jet Marines
- Group Battle Team: Baby Love (main vocalist)
- Position Battle Team: Uta Utai Bakari (center/main vocalist)
- Concept Battle Team: Honeymoon (main vocalist)
- Debut Evaluation Team: RUNWAY (sub vocalist 4)
Kouki’s rankings fluctuated throughout the show. He started at 35th place in Week 1, climbed to 32nd in Week 2, then 30th in Week 3. By the first ranking announcement, he dropped to 35th, but then surged to 19th in Week 6 and 10th in Week 7. Ultimately, he finished in 21st place-just outside the debut lineup.
Post-Produce 101 Japan:
Despite the elimination, Kouki’s determination never wavered. In April 2022, he participated in the project show “Bokutachi Debut Dekirukana” (Can We Debut?) alongside fellow Produce 101 Japan contestant Shinohara Mizuki. This show became the launching pad for what would eventually become KJRGL.
KJRGL Debut:
On August 10, 2024, Kouki was officially announced as a member of KJRGL. Alongside five other talented individuals, he finally achieved his debut dream-a moment nearly three years in the making.
Family Background
Information about Kouki’s family is not publicly available. He has kept his personal life private, focusing public attention on his music career.
Relationship Status
Kouki’s relationship status is not publicly available. As is common with K-pop and J-pop idols, he maintains privacy regarding his personal life.
Net Worth
As a rookie idol who debuted in late 2024, Kouki’s individual net worth has not been publicly disclosed. His income would come from group activities including album sales, streaming royalties, concert performances, and merchandise sales.
Social Media Profiles
- Instagram: Not publicly available
- X (Twitter): Not publicly available
- TikTok: Not publicly available
Interesting Facts About Kouki
- Kouki is the oldest member of KJRGL, born in January 2001.
- He is known for his “milk tea voice”-a sweet, smooth vocal tone that fans adore.
- He placed 21st on Produce 101 Japan Season 2, just three spots away from debuting with the final group.
- In the group, Kouki takes on a leadership-like role among the older members, often contributing ideas for the team.
- He trained for approximately three years before debuting with KJRGL.
- His blood type is A, which in Japanese and Korean pop culture is often associated with being organized and meticulous.
- He has a hobby of watching Western films.
- Kouki was a main vocalist in multiple Produce 101 Japan team performances, showcasing his vocal reliability.
- He was the only Produce 101 Japan Season 2 contestant in the final lineup of KJRGL.
- His Japanese name “Sakamoto” is written with characters meaning “slope” and “book,” while “Kouki” means “navigation” or “sailing record.”
Akira (아키라) Profile
Personal Information
| Category | Details |
|---|---|
| Full Name | Kawaguchi Akira (川口明) |
| Korean Name | N/A (Japanese member) |
| Stage Name | AKIRA |
| Date of Birth | Not publicly available |
| Age | Estimated early 20s |
| Zodiac Sign | Not publicly available |
| Chinese Zodiac | Not publicly available |
| Birthplace | Japan |
| Nationality | Japanese |
| Height | Not publicly available |
| Weight | Not publicly available |
| Blood Type | Not publicly available |
| MBTI Type | Not publicly available |
Group Role
| Category | Details |
|---|---|
| Position(s) | Leader, Vocalist |
| Representative Emoji | Not officially used |
| Training Period | TORA PROJECT 1st generation |
Early Life and Education
Akira was born in Japan as Kawaguchi Akira. Details about his early life, including his exact birth date and educational background, have not been publicly disclosed by his agency.
Career Journey
Pre-Debut Activities:
Akira’s path to debut was paved through Sony Music’s prestigious global artist development program, “TORA PROJECT.” He was selected as a member of the first generation of this program, which aimed to discover and nurture global talent.
The TORA PROJECT provided Akira with intensive training in vocals, dance, and performance, preparing him for the competitive world of idol entertainment. His participation in this program caught the attention of Sony Music executives, eventually leading to his selection for the KJRGL project.
KJRGL Debut:
On August 10, 2024, Akira was announced as a member of KJRGL alongside Kouki, Riku, Dien, Saeron, and Isaac. He was designated as the group’s leader and a vocalist.
Family Background
Akira’s family background has not been publicly disclosed. He has maintained privacy regarding his personal life.
Relationship Status
Akira’s relationship status is not publicly available.
Net Worth
As a rookie idol who debuted in late 2024, Akira’s individual net worth has not been publicly disclosed. His income would come from group activities.
Social Media Profiles
- Instagram: Not publicly available
- X (Twitter): Not publicly available
- TikTok: Not publicly available
Interesting Facts About Akira
- Akira is the leader of KJRGL.
- He was a member of the first generation of Sony Music’s TORA PROJECT.
- He describes himself as the “muscle vocal” member, combining his love for weight training with singing.
- Within the group, Akira takes on a “father-like” role, caring for the other members.
- Despite his muscular image, his singing style is gentle and soft.
- He was one of the Japanese members who participated in the “Bokutachi Debut Dekirukana” program.
- Akira took a brief hiatus from group activities but returned in August 2025.
- His full name in Japanese is written as 川口明.
- He is one of three Japanese members in the group alongside Kouki and Riku.
- His training through the TORA PROJECT gave him a strong foundation in both Korean and Japanese entertainment systems.
Riku (리쿠) Profile
Personal Information
| Category | Details |
|---|---|
| Full Name | Machida Riku (町田陸) |
| Korean Name | N/A (Japanese member) |
| Stage Name | RIKU |
| Date of Birth | Not publicly available |
| Age | Estimated early 20s |
| Zodiac Sign | Not publicly available |
| Chinese Zodiac | Not publicly available |
| Birthplace | Japan |
| Nationality | Japanese |
| Height | Not publicly available |
| Weight | Not publicly available |
| Blood Type | Not publicly available |
| MBTI Type | Not publicly available |
Group Role
| Category | Details |
|---|---|
| Position(s) | Rapper, Dancer |
| Representative Emoji | Not officially used |
| Training Period | Since at least 2023 |
Early Life and Education
Riku was born in Japan as Machida Riku. Specific details about his birth date, family background, and education have not been publicly released.
Career Journey
Pre-Debut Activities:
Riku’s career took a significant turn when he participated in Mnet’s “Boys Planet,” one of Korea’s most prominent idol survival shows. The show, which featured trainees from around the world competing for a debut spot in ZEROBASEONE (ZB1), exposed Riku to the intense competition of the K-pop industry.
On Boys Planet, Riku competed alongside trainees from various countries, gaining valuable experience in Korean-style idol training and performance. He described this experience as eye-opening-he had been naturally positive and had faced few setbacks before, but confronting the global competition taught him that “when you face the world, things don’t go well more often than not”.
Post-Boys Planet:
After Boys Planet, Riku participated in the “Bokutachi Debut Dekirukana” program, where he was eventually selected for the KJRGL project.
KJRGL Debut:
On August 10, 2024, Riku was officially announced as a member of KJRGL. He serves as the group’s rapper and a dancer.
Family Background
Riku’s family background has not been publicly disclosed.
Relationship Status
Riku’s relationship status is not publicly available.
Net Worth
As a rookie idol, Riku’s individual net worth has not been publicly disclosed.
Social Media Profiles
- Instagram: Not publicly available
- X (Twitter): Not publicly available
- TikTok: Not publicly available
Interesting Facts About Riku
- Riku is one of the Japanese members who competed on Mnet’s Boys Planet.
- He is the group’s primary rapper.
- Riku describes himself as a “genius of style” and “skeletal Riku” due to his impressive physique.
- He admits to being a person who “never says anything serious” in daily life, embracing a playful personality.
- On stage, his standout skill is dancing.
- Before the Korean members joined, Riku played basketball with the Japanese members only.
- He has expressed interest in becoming a brand model.
- Riku was one of the members who participated in both Boys Planet and the “Bokutachi Debut Dekirukana” program.
- His full name in Japanese is written as 町田陸.
- He is known for his positive personality, though he admits to having faced challenges on the global stage.
Dien / Hojin (디엔 / 호진) Profile
Personal Information
| Category | Details |
|---|---|
| Full Name | Jung Ho-jin (정호진) |
| Korean Name | 정호진 |
| Stage Name | DIEN (formerly), HOJIN (current) |
| Date of Birth | February 27, 2003 |
| Age | 23 (In 2026) |
| Zodiac Sign | Pisces |
| Chinese Zodiac | Goat (2003) |
| Birthplace | South Korea |
| Nationality | South Korean |
| Height | Not publicly available |
| Weight | Not publicly available |
| Blood Type | Not publicly available |
| MBTI Type | Not publicly available |
Group Role
| Category | Details |
|---|---|
| Position(s) | Vocalist, Mood Maker |
| Representative Emoji | Not officially used |
| Training Period | Multiple years |
Early Life and Education
Jung Ho-jin was born on February 27, 2003, in South Korea. From a young age, he showed interest in music and performance, eventually pursuing a career as an idol.
Career Journey
Pre-Debut Activities:
Dien (as he was then known) was a trainee who participated in multiple pre-debut projects. He was a member of the trainee group M.I.C and the pre-debut group DSP N. These experiences gave him valuable training and performance exposure before his major break.
His career gained significant momentum when he participated in Mnet’s “Boys Planet” alongside Riku and numerous other trainees. Though he did not make the final debut lineup (which became ZEROBASEONE), the show provided him with crucial visibility and experience.
KJRGL Debut:
On August 10, 2024, Dien was officially announced as a member of KJRGL. He is known as the group’s mood maker, bringing bright energy and enthusiasm to the team.
Name Change:
In October 2025, following the group’s rebranding to KAJA, Dien changed his stage name to Hojin (his birth name).
Family Background
Information about Hojin’s family has not been publicly disclosed.
Relationship Status
Hojin’s relationship status is not publicly available.
Net Worth
As a rookie idol, Hojin’s individual net worth has not been publicly disclosed. His income would come from group activities including album sales, streaming, concerts, and merchandise.
Social Media Profiles
- Instagram: Not publicly available
- X (Twitter): Not publicly available
- TikTok: Not publicly available
Interesting Facts About Hojin
- Hojin was born on February 27, 2003, making him 23 years old in 2026.
- He participated in Mnet’s Boys Planet.
- He was a member of trainee group M.I.C and pre-debut group DSP N.
- Hojin describes himself as the group’s mood maker-bright, energetic, and confident.
- He claims to be “cool” and has confidence in his dancing abilities.
- He changed his stage name from DIEN to HOJIN in October 2025.
- He is one of three Korean members in the group alongside Saeron and Isaac.
- His experience on Boys Planet exposed him to global competition and helped shape his performance skills.
- He is known for his bright, energetic personality that lifts the group’s spirits.
- His Chinese zodiac sign is Goat (born in 2003).
Saeron (새론) Profile
Personal Information
Group Role
| Category | Details |
|---|---|
| Position(s) | Vocalist, Dancer |
| Representative Emoji | Not officially used |
| Training Period | Multiple years |
Early Life and Education
Lee Saeron was born on December 13, 2003, in Seoul, South Korea. He grew up in an environment surrounded by music and art. His mother is the renowned Korean singer Han Seo-kyeong (한서경), famous for the hit song “Nangrang 18-se” (낭랑 18세). Growing up watching his mother perform on stage deeply influenced his career path.
In middle school, Saeron was inspired by watching idols perform on stage and began dreaming of becoming a singer himself. However, during his first year of high school, he experienced doubt and questioned whether he was cut out to be a singer. He started performing at a small theater, which led to him being scouted-and that’s when he decided to pursue idol life seriously.
Saeron also has acting experience, appearing in programs such as SBS’s “Bun O Bang” and MBC’s “Gongbuga Meoni?” He also performed in the play “Almost, Maine,” taking on the roles of PETE, STEVE, and PHIL.
Career Journey
Pre-Debut Activities:
Before joining KJRGL, Saeron had already built a diverse entertainment portfolio. His acting appearances and theater work demonstrated his versatility as a performer.
KJRGL Debut:
On August 10, 2024, Saeron was announced as a member of KJRGL. He serves as a vocalist and dancer in the group.
Family Background
Saeron is the son of Korean singer Han Seo-kyeong, who was known for the song “Nangrang 18-se”. His mother’s career in the entertainment industry provided him with early exposure to the world of performance. His father’s identity has not been publicly disclosed.
Relationship Status
Saeron’s relationship status is not publicly available.
Net Worth
As a rookie idol, Saeron’s individual net worth has not been publicly disclosed.
Social Media Profiles
- Instagram: Not publicly available
- X (Twitter): Not publicly available
- TikTok: Not publicly available
Interesting Facts About Saeron
- Saeron is the son of legendary Korean singer Han Seo-kyeong.
- He was born on December 13, 2003, making him 22 years old in 2026.
- He is from Seoul, South Korea.
- Saeron describes himself as a “model student” who is serious and very smart.
- However, he admits to occasionally becoming a “mischievous boy”.
- He considers dancing his strength in the group.
- He started studying Japanese in January 2024 to prepare for the group’s activities.
- He has extensive acting experience, including theater performances and television appearances.
- He grew up watching his mother perform, which inspired his musical aspirations.
- He can sing, dance, and act.
- His zodiac sign is Sagittarius.
- He is one of three Korean members in the group.
Isaac (아이작) Profile
Personal Information
Group Role
| Category | Details |
|---|---|
| Position(s) | Vocalist, Maknae (youngest) |
| Representative Emoji | Not officially used |
| Training Period | Multiple years |
Early Life and Education
Isaac was born Oh Kae-ming on December 12, 1994, in Malaysia. He holds Malaysian nationality and also possesses U.S. citizenship. His multicultural background-Asian by birth with American citizenship-makes him one of the most internationally diverse members of KJRGL.
Career Journey
Pre-Debut Activities:
Isaac’s entertainment career began in 2016 when he participated in Mnet’s music survival show “Boy24” (소년24). The show was a large-scale competition that aimed to form a new boy group. In the “Boy24 FINAL” held on August 12, 2017, Isaac was selected into the debut group, ranking 6th overall. However, the group’s activities were limited, and Isaac continued his journey as a trainee.
Following “Boy24,” Isaac trained at a well-known K-pop agency in South Korea. His training period spanned several years, during which he honed his vocals, dance, and performance skills.
KJRGL Debut:
On August 10, 2024, Isaac was officially announced as a member of KJRGL. He serves as the group’s maknae (youngest member) and a vocalist.
Family Background
Isaac’s family background has not been publicly disclosed. Born in Malaysia, he relocated to South Korea to pursue his idol career.
Relationship Status
Isaac’s relationship status is not publicly available.
Net Worth
As a rookie idol who debuted in late 2024, Isaac’s individual net worth has not been publicly disclosed. His income would come from group activities. His previous experience in the entertainment industry may have provided additional income sources prior to KJRGL.
Social Media Profiles
Interesting Facts About Isaac
- Isaac is the oldest member by birth year (1994) but serves as the group’s maknae in terms of debut timing and group dynamics.
- He was born on December 12, 1994, making him 31 years old in 2026.
- He is Malaysian by birth but holds U.S. citizenship.
- He stands at 176 cm (5’9″) and weighs 56 kg (123 lbs).
- His blood type is O.
- He participated in Mnet’s Boy24 survival show in 2016.
- He ranked 6th in the Boy24 FINAL and was selected for the debut group.
- He trained at a prominent K-pop agency before joining KJRGL.
- His full name is Oh Kae-ming (邬凯名).
- He is one of three Korean members (though his nationality is Malaysian with U.S. citizenship).
- His zodiac sign is Sagittarius.
- He has an active Instagram account: isaacvkm1212.
- He released solo music prior to KJRGL, including the single “RisingStar” in 2016.
- His Chinese zodiac sign is Dog (born in 1994).
- Despite being the oldest, he is affectionately considered the group’s maknae due to his youthful energy.
Former Members
On 2026, KJRGL (now KAJA) has no former members. The group has maintained its original six-member lineup since debut. All members-Kouki, Akira, Riku, Hojin (formerly Dien), Saeron, and Isaac-remain active with the group.
However, it’s worth noting that member Akira took a brief hiatus from group activities in 2025 but returned in August 2025.
Discography
Digital Singles
EPs and Mini Albums
| Title | Release Date | Type |
|---|---|---|
| “Prelude~The Brilliant Blue” | November 27, 2024 | 1st EP |
| “Cloud_Six” | April 23, 2025 | 1st Mini Album |
Notable Songs
- “Beautiful Dream” (Lead track from 1st EP)
- “Prologue~The Deepest Blue (Acoustic ver.)”
- “Overture~The Blue Wave” (Multiple versions)
Music Style and Influence
Musical Identity
KJRGL’s music is built around their signature “ocean trilogy” concept-a narrative of emerging from the deep sea. Their pre-debut single “Prologue~The Deepest Blue” represents the darkness and isolation of the deep ocean, while “Overture~The Blue Wave” symbolizes the journey toward the surface and finding one’s voice.
Concepts
The group’s visual and musical concepts are deeply intertwined with aquatic imagery. Their music videos and promotional materials consistently feature water, whales, and oceanic themes. This cohesive branding sets them apart from typical idol groups and gives their discography a unique narrative arc.
Artistic Evolution
From their debut in 2024 through their rebranding as KAJA in 2025, KJRGL has shown consistent artistic growth. Their early work focused on the whale metaphor and the journey from darkness to light, while their newer material under the KAJA name emphasizes forward momentum and evolution.
Influences
As a group trained in both Korean and Japanese idol systems, KJRGL draws from both K-pop and J-pop traditions. Their music incorporates the polished production and performance intensity of K-pop while maintaining the melodic sensibilities and emotional resonance characteristic of J-pop.
Awards and Achievements
As a rookie group that debuted in late 2024, KJRGL is still in the early stages of their career. Specific award wins and music show victories have not been publicly documented On 2026. However, the group has achieved several significant milestones:
Tours and Concerts
| Event | Date | Venue |
|---|---|---|
| KJRGL Debut Live “KJRGlad to sea you!!” | December 23, 2024 | Spotify O-WEST, Shibuya, Tokyo |
Additional tour dates and fan meetings have not been publicly announced On 2026.
Brand Endorsements and Ambassadorships
On 2026, no major brand endorsements or official ambassadorships have been publicly confirmed for KJRGL (now KAJA). As a relatively new group, they are likely in the early stages of building their brand partnerships.
Social Media Presence
| Platform | Account | Status |
|---|---|---|
| @kjrgl_official (rebranded to @kaja_official) | Active | |
| X (Twitter) | @KJRGL_offcl (rebranded) | Active |
| TikTok | @kjrgl_official (rebranded) | Active |
| YouTube | KJRGL Official (rebranded to KAJA) | Active |
| Weverse | Not confirmed | N/A |
| Official Website | Not publicly available | N/A |
Note: All social media accounts were rebranded following the group’s name change to KAJA in October 2025.
Net Worth and Revenue Sources
As a newly debuted group (2024), KJRGL’s collective and individual net worth figures have not been publicly disclosed. However, their revenue streams would typically include:
- Album Sales – Physical and digital album sales
- Streaming Revenue – From platforms like Spotify, Apple Music, Melon, etc.
- Concerts and Fan Meetings – Ticket sales and merchandise at live events
- Merchandise – Official group goods and merchandise
- Endorsements – Brand partnerships and sponsorships (future)
- Broadcast Appearances – TV shows, variety programs, and radio appearances
As a Sony Music Entertainment project, the group benefits from the resources and distribution network of one of the world’s largest music corporations.
20 Interesting Facts About KJRGL
- KJRGL stands for “Kind (of) Just Right Good Luck” according to Sony Music Japan.
- The name also combines the Japanese word “kujira” (whale) with the Korean word “golae” (whale).
- The group consists of three Japanese members and three Korean members (one of whom holds U.S. citizenship).
- Their official fandom name is VOISEA, combining “VOICE” and “SEA”.
- Kouki placed 21st on Produce 101 Japan Season 2.
- Riku and Hojin (formerly Dien) both competed on Mnet’s Boys Planet.
- Akira was a member of Sony Music’s TORA PROJECT first generation.
- Saeron is the son of legendary Korean singer Han Seo-kyeong.
- Isaac was born in Malaysia and holds U.S. citizenship.
- Isaac participated in Mnet’s “Boy24” survival show in 2016.
- The group’s concept is based on whales emerging from the deep sea to find their voice.
- Their debut concert was titled “KJRGlad to sea you!!”-a playful whale pun.
- The group rebranded to KAJA in October 2025, meaning “Let’s go!” in Korean.
- Member Hojin changed his stage name from DIEN to HOJIN during the rebrand.
- KJRGL is a joint project between Sony Music Japan and Sony Music Korea.
- The group’s “ocean trilogy” consists of three releases exploring the whale narrative.
- Kouki is the oldest member by birth date (January 9, 2001).
- Saeron started studying Japanese in January 2024 to prepare for the group.
- Akira serves as the group’s leader.
- The group’s first EP, “Prelude~The Brilliant Blue,” was released on November 27, 2024.
Frequently Asked Questions (FAQ)
1. Who is the leader of KJRGL?
2. How many members does KJRGL have?
KJRGL has six members: Kouki, Akira, Riku, Hojin (formerly Dien), Saeron, and Isaac.
3. When did KJRGL debut?
KJRGL officially debuted on September 18, 2024.
4. Who is the oldest member of KJRGL?
Kouki (born January 9, 2001) is the oldest member by birth date. However, Isaac (born December 12, 1994) is the oldest by birth year.
5. Who is the youngest member of KJRGL?
Isaac is considered the group’s maknae (youngest), despite being the oldest by birth year.
6. What agency manages KJRGL?
KJRGL is jointly managed by Sony Music Labels Inc. (Japan) and Sony Music Entertainment Korea.
7. What is the fandom name of KJRGL?
The official fandom name is VOISEA, combining “VOICE” and “SEA”.
8. What are the members’ positions in KJRGL?
- Akira: Leader, Vocalist
- Kouki: Vocalist
- Riku: Rapper, Dancer
- Hojin (Dien): Vocalist, Mood Maker
- Saeron: Vocalist, Dancer
- Isaac: Vocalist, Maknae
9. What does KJRGL stand for?
KJRGL stands for “Kind (of) Just Right Good Luck”. It also combines the Japanese word for whale (kujira) and the Korean word for whale (golae).
10. Did KJRGL change their name?
Yes, KJRGL rebranded to KAJA (카자) in October 2025.
11. What does KAJA mean?
KAJA means “Let’s go!” in Korean and represents the group’s commitment to evolving with their fans.
12. Which members participated in survival shows?
- Kouki: Produce 101 Japan Season 2
- Riku: Boys Planet
- Hojin (Dien): Boys Planet
- Akira: TORA PROJECT
- Isaac: Boy24
13. What is KJRGL’s concept?
KJRGL’s concept is based on whales emerging from the deep sea-a metaphor for finding one’s voice after struggling in darkness.
14. Where is Saeron’s mother famous?
Saeron’s mother is Han Seo-kyeong, a Korean singer famous for the hit song “Nangrang 18-se”.
15. Where is Isaac from?
Isaac was born in Malaysia and holds U.S. citizenship.
16. What was KJRGL’s debut song?
KJRGL’s debut song was “Overture~The Blue Wave,” released on September 18, 2024.
17. Did KJRGL have a pre-debut release?
Yes, they released “Prologue~The Deepest Blue” on September 4, 2024, as a pre-debut single.
18. When was KJRGL’s first concert?
KJRGL held their first live concert, “KJRGlad to sea you!!,” on December 23, 2024 at Spotify O-WEST in Tokyo.
19. What is KJRGL’s first EP?
Their first EP is “Prelude~The Brilliant Blue,” released on November 27, 2024.
20. Is KJRGL still active in 2026?
Yes, the group is active in 2026 under the new name KAJA.
Conclusion
KJRGL represents a bold experiment in cross-border idol collaboration-a group born from the partnership of Sony Music Japan and Sony Music Korea, bringing together six young men from different backgrounds, each carrying their own story of perseverance.
From Kouki’s near-miss on Produce 101 Japan to Riku and Hojin’s Boys Planet journey, from Akira’s TORA PROJECT training to Saeron’s legacy as the son of a legendary singer, and Isaac’s跨国 path from Malaysia to Korea-every member of KJRGL has a unique narrative that contributes to the group’s collective identity.
Their whale-inspired concept-rising from the deep sea to find their voice-resonates not just as a marketing theme but as a genuine reflection of their journeys. Each member faced rejection, uncertainty, and doubt before finally debuting in September 2024.
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