Who Is CORTIS? Boy Band Biography, Members, Ages, Songs, Albums, and Career
Introduction
Who is CORTIS? CORTIS is a five-member South Korean boy band formed by BIGHIT MUSIC, the entertainment company behind global K-pop groups BTS and TOMORROW X TOGETHER (TXT). The group consists of Martin, James, Juhoon, Seonghyeon, and Keonho. Known for their creative approach to music, energetic performances, and involvement in songwriting, choreography, and visual production, CORTIS has emerged as one of the notable new acts in the fifth generation of K-pop.
CORTIS officially debuted on August 18, 2025, with the single “What You Want.” Their first EP, COLOR OUTSIDE THE LINES, followed on September 8, 2025, introducing a musical identity that combines hip-hop, pop, alternative rock, and experimental sounds. In May 2026, the group returned with its second EP, GREENGREEN, led by the track “REDRED.”
What makes CORTIS particularly interesting is its identity as a young creator crew. Rather than focusing exclusively on singing and dancing, the five members participate in different aspects of the creative process, including music production, songwriting, choreography, and music video development.
Here is everything to know about CORTIS, including its members, ages, birthdays, group name meaning, debut, popular songs, albums, record label, and growing music career.
CORTIS Biography: Quick Facts
| Category | Details |
|---|---|
| Group name | CORTIS |
| Korean name | 코르티스 |
| Origin | South Korea |
| Group type | K-pop boy band |
| Agency | BIGHIT MUSIC |
| Parent company | HYBE |
| Number of members | 5 |
| Members | Martin, James, Juhoon, Seonghyeon, Keonho |
| Debut date | August 18, 2025 |
| Debut single | “What You Want” |
| First EP | COLOR OUTSIDE THE LINES |
| Second EP | GREENGREEN |
| Music genres | K-pop, hip-hop, pop, alternative rock |
| Official fandom name | COER |
| Years active | 2025–present |
What Does CORTIS Mean?
The name CORTIS comes from the phrase “COLOR OUTSIDE THE LINES.” The six letters were selected irregularly from the phrase to create a distinctive group name.
The concept represents freedom, originality, and the willingness to think beyond the expectations and rules established by society. It reflects the group’s desire to create music and visual content without being restricted by conventional ideas.
This meaning is closely connected to CORTIS’s creative identity. The members have emphasized that they want to explore their own interests, experiment with different sounds, and express their personalities through music.
The phrase also provides the foundation for the group’s debut EP, COLOR OUTSIDE THE LINES. Its central idea is about discovering what they genuinely want instead of simply following a path chosen by others.
Who Are the CORTIS Members?
CORTIS has five members: Martin, James, Juhoon, Seonghyeon, and Keonho. Each contributes different musical and creative strengths to the group.
1. Martin
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Stage name: Martin
Birth date: March 20, 2008
Age: 18 (as of November 2026)
Position: Leader and creative contributor
Martin is the leader of CORTIS and one of the group’s prominent creative figures. He is known for his involvement in songwriting and music production, helping shape the group’s sound and artistic direction.
Before debuting with CORTIS, Martin had already gained experience contributing to music projects connected to other HYBE artists. His work behind the scenes gave him valuable experience in the recording process and helped prepare him for his role in the group.
As a performer, he brings a confident stage presence and a strong interest in experimentation. His creative contributions are particularly important to CORTIS’s identity as a group that participates actively in making its own music.
2. James
Stage name: James
Birth date: October 14, 2005
Age: 21 (as of November 2026)
Background: Thai-Taiwanese heritage
James is the oldest member of CORTIS and an experienced performer with a background in dance and choreography.
Before joining the group, he was associated with HYBE’s trainee project Trainee A. His earlier training helped him develop performance skills and an understanding of the preparation required for professional music releases.
James has also contributed to choreography and songwriting projects connected to other HYBE artists. Within CORTIS, his experience in dance and performance adds another dimension to the group’s creative process.
His combination of musical and performance skills makes him an important member of the team’s collaborative approach.
3. Juhoon
Stage name: Juhoon
Birth date: January 3, 2008
Age: 18 (as of November 2026)
Nationality: South Korean
Juhoon is one of the members who contributes to CORTIS’s performance and creative identity.
Before debuting, he had experience in activities outside the music industry, including modeling and other performance-related opportunities. These experiences helped him become comfortable in front of cameras and audiences.
His personality and performance style add variety to the group. He also participates in the collaborative creative process that defines CORTIS, contributing ideas to the group’s music and artistic projects.
4. Seonghyeon
Stage name: Seonghyeon
Birth date: January 13, 2009
Age: 17 (as of November 2026)
Nationality: South Korean
Seonghyeon is one of the younger members of CORTIS. He is recognized for his contributions to songwriting, performance, and the group’s collaborative projects.
His involvement in music creation reflects the group’s philosophy that members should have opportunities to participate in shaping their artistic identity.
Seonghyeon contributes to the team’s overall sound and stage performances while continuing to develop his skills as a young K-pop artist.
5. Keonho
Stage name: Keonho
Birth date: February 14, 2009
Age: 17 (as of November 2026)
Nationality: South Korean
Keonho is the youngest member, commonly referred to as the group’s maknae in K-pop terminology.
Before becoming an idol, he reportedly had experience as a competitive swimmer. His athletic background reflects the discipline and physical preparation that can also be valuable in demanding performance schedules.
Within CORTIS, Keonho participates in music and creative activities while contributing to the group’s performances and visual identity.
Although he is the youngest member, he is part of the same collaborative approach that allows all five performers to contribute ideas.
How Did CORTIS Debut?
CORTIS was formed by BIGHIT MUSIC, a South Korean entertainment company known internationally for managing BTS and TOMORROW X TOGETHER.
The group was introduced in August 2025 as the label’s first new boy group in six years following TXT’s debut in 2019.
CORTIS officially debuted on August 18, 2025, with the digital single “What You Want.” The song introduced the group’s musical direction through a combination of psychedelic rock guitar influences and hip-hop-based boom bap rhythms.
Its confident message reflected the group’s name and creative philosophy: pursuing what they want rather than accepting predetermined expectations.
The members also attracted attention for their involvement in the debut’s choreography and visual production. Their introduction emphasized the idea of a group that actively participates in creating its own artistic identity.
CORTIS’s First EP: COLOR OUTSIDE THE LINES (2025)
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On September 8, 2025, CORTIS released its first EP, COLOR OUTSIDE THE LINES.
The project introduced five tracks that explored the group’s creative interests, personal experiences, and desire for artistic independence.
The EP includes:
- “GO!” – A confident introduction featuring minimal trap rhythms and sharp synth sounds.
- “What You Want” – The lead single, combining psychedelic rock guitar influences with hip-hop rhythms.
- “FaSHioN” – A high-energy track exploring fashion and personal expression.
- “JoyRide” – A melodic song influenced by alternative rock and pop.
- “Lullaby” – A more atmospheric track featuring psychedelic soul influences and themes of friendship and reassurance.
The members participated in the creative process across the project, including songwriting and other production-related activities.
The EP made a strong international impression, reaching No. 15 on the Billboard 200. Its performance helped establish CORTIS as a group attracting attention beyond South Korea.
CORTIS’s Second EP: GREENGREEN (2026)
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CORTIS continued its musical development with the release of its second EP, GREENGREEN, on May 4, 2026.
The project presents a clearer picture of the group’s evolving musical preferences. While the debut focused on discovering its identity, GREENGREEN explores the interests, experiences, and creative ideas that have become more recognizable within the group.
The EP features six tracks:
- “TNT” – A song about the members discovering their creative potential in the studio.
- “REDRED” – The title track, featuring distinctive lyrics, memorable melodies, and an energetic sound.
- “ACAI” – A track inspired by the members’ everyday experiences and food preferences.
- “YOUNGCREATORCREW” – A song that explores the group’s identity as young creators.
- “Wassup” – A track expressing confidence and the determination to move forward.
- “Blue Lips” – A more emotional song exploring the complicated feelings that can come with caring deeply about something.
As with the debut project, all five members were involved in the creative process. Their participation extended beyond songwriting to include choreography and music video development.
GREENGREEN helped demonstrate that CORTIS was continuing to build its own musical language rather than simply repeating the formula of its first release.
What Are CORTIS’s Most Popular Songs?
CORTIS has developed a growing catalog since its debut. Several tracks provide a good introduction to the group’s musical range.
| Song | Release | Musical identity |
|---|---|---|
| “What You Want” | 2025 | Psychedelic rock and boom bap influences |
| “GO!” | 2025 | Minimal trap and hip-hop-inspired pop |
| “FaSHioN” | 2025 | Trap and Southern hip-hop influences |
| “JoyRide” | 2025 | Alternative rock and pop melodies |
| “Lullaby” | 2025 | Psychedelic soul and atmospheric production |
| “TNT” | 2026 | Energetic creative expression |
| “REDRED” | 2026 | Catchy melodies and distinctive production |
| “ACAI” | 2026 | Everyday experiences expressed through music |
| “YOUNGCREATORCREW” | 2026 | The group’s creative identity |
| “Blue Lips” | 2026 | Emotional and reflective songwriting |
These songs illustrate why the group is difficult to place in just one musical category. CORTIS moves between hip-hop, pop, alternative rock, and experimental influences.
What Makes CORTIS Different From Other K-Pop Boy Bands?
One of CORTIS’s defining characteristics is its emphasis on creative participation.
The group has been introduced as a young creator crew, with members contributing to music, choreography, and video production. This approach gives the members opportunities to express their individual ideas while developing a shared artistic direction.
Another distinguishing feature is musical experimentation. Their releases do not rely on one consistent genre. Instead, the group combines different sounds and production styles to create a varied catalog.
Their visual identity is also important. Fashion, performance films, choreography, and music videos are treated as connected parts of the group’s creative expression.
This combination of music-making, performance, and visual storytelling is central to CORTIS’s identity.
Which Entertainment Company Manages CORTIS?
CORTIS is managed by BIGHIT MUSIC, a South Korean entertainment label under HYBE.
The company is internationally known for its work with BTS and TOMORROW X TOGETHER. CORTIS became its first new boy group in six years following TXT’s debut in 2019.
Being part of BIGHIT MUSIC gives the group access to an established entertainment and production environment. However, CORTIS has also emphasized developing an identity of its own through member participation and musical experimentation.
What Is CORTIS’s Fandom Name?
CORTIS’s official fandom name is COER.
The fandom represents the community of supporters who follow the group’s music, performances, and activities. Like other K-pop fandoms, COER plays an important role in supporting releases, streaming music, attending events, and sharing content internationally.
Frequently Asked Questions About CORTIS
Who is CORTIS?
CORTIS is a five-member South Korean boy band formed by BIGHIT MUSIC. The group consists of Martin, James, Juhoon, Seonghyeon, and Keonho.
When did CORTIS debut?
CORTIS officially debuted on August 18, 2025, with the digital single “What You Want.”
Who are the members of CORTIS?
The five members are Martin, James, Juhoon, Seonghyeon, and Keonho.
How many members does CORTIS have?
CORTIS has five members.
What does CORTIS mean?
CORTIS is derived from the phrase “COLOR OUTSIDE THE LINES.” The name represents creative freedom and thinking beyond conventional rules.
Which company manages CORTIS?
CORTIS is managed by BIGHIT MUSIC, a label under HYBE.
How old are the CORTIS members?
As of November 2026, the members’ ages are:
- James: 21
- Martin: 18
- Juhoon: 18
- Seonghyeon: 17
- Keonho: 17
What is CORTIS’s debut song?
Their debut single is “What You Want,” released on August 18, 2025.
What is CORTIS’s first album?
Their first EP is COLOR OUTSIDE THE LINES, released on September 8, 2025.
What is CORTIS’s latest EP?
Their second EP, GREENGREEN, was released on May 4, 2026.
What is CORTIS’s fandom name?
The group’s official fandom name is COER.
Is CORTIS connected to BTS?
Yes. CORTIS and BTS are both associated with BIGHIT MUSIC, although they are separate groups with their own members, music, and artistic identities.
Conclusion
CORTIS is a South Korean boy band bringing a creative and experimental approach to the modern K-pop scene. Formed by BIGHIT MUSIC, the five-member group consists of Martin, James, Juhoon, Seonghyeon, and Keonho.
Since debuting in August 2025 with “What You Want,” CORTIS has developed its identity through projects such as COLOR OUTSIDE THE LINES and GREENGREEN. Its music combines hip-hop, pop, alternative rock, and other influences, while the members’ involvement in songwriting, choreography, and visual production gives the group a distinctive creative direction.
With a growing discography and an international audience, CORTIS continues to develop its identity as one of the newer groups attracting attention in K-pop. Its commitment to creative freedom and collaboration remains at the heart of its musical journey.