If you have been scrolling through K-pop content lately, the name CORTIS keeps popping up — and for good reason. This five-member boy group, signed under BIGHIT MUSIC, debuted in 2025 and already draws millions of curious fans.
Group Name: CORTIS ·
Members: 5 (Martin, James, Juhoon, Seonghyeon, Keonho) ·
Agency: BIGHIT MUSIC ·
Debut Year: 2025 ·
Instagram Followers: 13M ·
Latest EP: GREENGREEN
(Sources: Kpop Profiles – fan database)
Quick snapshot
- Five members: Martin, James, Juhoon, Seonghyeon, Keonho (Kpop Profiles – fan database)
- Group under BIGHIT MUSIC (Kpop Profiles – fan database)
- Debuted in 2025 (Kpop Profiles – fan database)
- Exact birth dates not officially confirmed (Kpop Profiles – fan database)
- Official positions not announced (Kpop Profiles – fan database)
- Nationalities of all members unverified by BIGHIT (Kpop Profiles – fan database)
- No major upcoming events officially announced (Kpop Profiles – fan database)
- Awaiting official position announcements and debut stage schedule (Famous Birthdays – celebrity data)
Seven confirmed data points, one catch: several key details are still based on fan databases rather than official statements.
| Label | Value |
|---|---|
| Group Name | CORTIS |
| Korean Name | |
| Agency | BIGHIT MUSIC |
| Debut Date | 2025 (exact date TBA) |
| Number of Members | 5 |
| Latest Release | 2nd EP ‘GREENGREEN’ |
| @cortis (13M followers) |
Source: Kpop Profiles – fan database
Who are the members of the CORTIS line?
The five young men stepping into the spotlight under BIGHIT MUSIC bring a mix of backgrounds and talents. Here is a quick profile of each.
Martin
- Listed by fan databases as the group’s leader and main rapper (Kpop Profiles – fan database)
- Birthday: 2008-03-20 (Kpop Profiles – fan database)
- Described as Korean-Canadian in fan profiles (Kpop Profiles – fan database)
- Known to speak English (YouTube – fan video)
James
- Birthday: 2005-10-14 (Kpop Profiles – fan database)
- Listed as Thai-Taiwanese, though some sources say Thai-Hong Kongese (Kpop Profiles – fan database)
- Rumored to be main dancer and visual (Kpop Profiles – fan database)
- English speaker – often heard in group content (YouTube – fan video)
Juhoon
- Birthday: 2008-01-03 (Kpop Profiles – fan database)
- Listed as Korean (Kpop Profiles – fan database)
- Rumored to be sub-vocalist with a deep voice (Kpop Profiles – fan database)
Seonghyeon
- Birthday: 2009-01-13 (Kpop Profiles – fan database)
- Listed as Korean (Kpop Profiles – fan database)
- Rumored to be lead vocalist and dancer (Kpop Profiles – fan database)
Keonho
- Birthday: 2009-02-14 (Kpop Profiles – fan database)
- Listed as Korean (Kpop Profiles – fan database)
- Commonly referred to as maknae (youngest) and lead vocalist (Kpop Profiles – fan database)
The only member with a consistent multilingual advantage is Martin — if BIGHIT aims for global reach, his Korean-Canadian background and English fluency give him a natural bridge role.
The implication: Martin is the de facto public face, while James and Keonho carry vocal weight. The group’s diversity of backgrounds hints at a strategy that mirrors BIGHIT’s earlier global playbook.
How old are the CORTIS members?
Age is one of the most searched details about the group, yet official confirmation remains elusive. Here is what fan sources report.
Ages of each member
- Martin: born 2008-03-20 (age 16–17 depending on timing) (Kpop Profiles – fan database)
- James: born 2005-10-14 (age 19–20) (Kpop Profiles – fan database)
- Juhoon: born 2008-01-03 (age 16–17) (Kpop Profiles – fan database)
- Seonghyeon: born 2009-01-13 (age 15–16) (Kpop Profiles – fan database)
- Keonho: born 2009-02-14 (age 15–16) (Kpop Profiles – fan database)
Who is 16 years old in CORTIS?
Based on fan-recorded birth dates, the members who were 16 as of early 2025 are Martin (March 2008) and Juhoon (January 2008). Seonghyeon and Keonho (both 2009) are likely 15–16, while James (2005) is the oldest at 19–20.
Who is the oldest and youngest?
- Oldest: James (2005-10-14) (Kpop Profiles – fan database)
- Youngest: Keonho and Seonghyeon (both 2009; Keonho is often listed as maknae) (Kpop Profiles – fan database)
No official birth dates have been published by BIGHIT MUSIC. All ages cited here come from fan-curated profiles, which are not independently verified.
The pattern: CORTIS is a very young group — average age around 16–17 based on fan data. This places them squarely in the teen-idol market, a lane BIGHIT has successfully managed before.
What are the positions of CORTIS members?
Official position announcements are still pending. Until then, fan communities and online profiles assign roles based on content clues.
Official positions from BIGHIT
None have been released. The group debuted without traditional role labels (leader, main vocalist, etc.) (Kpop Profiles – fan database).
Fan-assigned roles
- Martin: leader, main rapper (Kpop Profiles – fan database)
- James: lead dancer, visual (Kpop Profiles – fan database)
- Juhoon: sub-vocalist (Kpop Profiles – fan database)
- Seonghyeon: lead vocalist, dancer (Kpop Profiles – fan database)
- Keonho: maknae, lead vocalist, centre (Kpop Profiles – fan database)
The trade-off: without official positions, every role is speculative. This leaves room for BIGHIT to adjust after debut, but also creates confusion for fans trying to follow the group.
Can everyone in CORTIS speak English?
Global appeal is a stated goal for CORTIS, and language ability is a big part of that. Here is what is known.
English proficiency of each member
- Martin: fluent English speaker (YouTube – fan video)
- James: observed using English in content (YouTube – fan video)
- Juhoon: assumed limited English; no strong evidence of fluency (Kpop Profiles – fan database)
- Seonghyeon: no public English use observed (Kpop Profiles – fan database)
- Keonho: minimal English observed (Kpop Profiles – fan database)
Multilingual background
Martin’s Korean-Canadian heritage and James’s international upbringing suggest the group may have at least two strong English speakers. BIGHIT has not released official language profiles (Kpop Profiles – fan database).
If CORTIS targets Western markets, Martin and James will likely lead English interviews. The other members may need translation support, which could shape their roles in international promotions.
The pattern: English ability is concentrated in two members, which is typical for K-pop groups aiming for global reach — but it also creates a reliance on those members for cross-language content.
How to differentiate CORTIS members?
With five young faces, telling them apart takes a little practice. Here are visual and role-based clues.
Visual differences
- Martin: sharp jawline, often wears hats or beanies (Kpop Profiles – fan database)
- James: taller, long wavy hair, distinct eye shape (Kpop Profiles – fan database)
- Juhoon: smaller build, deep-set eyes, short hair (Kpop Profiles – fan database)
- Seonghyeon: round face, youthful look, often smiles (Kpop Profiles – fan database)
- Keonho: centre of group photos, bright eyes, baby face (Kpop Profiles – fan database)
Role and personality differences
- Martin: confident, speaks the most in interviews (YouTube – fan video)
- James: reserved, often seen laughing (YouTube – fan video)
- Juhoon: serious expressions, deep voice (Kpop Profiles – fan database)
- Seonghyeon: energetic, playful (Kpop Profiles – fan database)
- Keonho: shy but charismatic on stage (Kpop Profiles – fan database)
Age and height
- Oldest: James (19–20) (Kpop Profiles – fan database)
- Youngest: Keonho and Seonghyeon (15–16) (Kpop Profiles – fan database)
- No official heights published; fan estimates vary (Kpop Profiles – fan database)
The trade-off: without official measurements, differentiation relies on visual cues and fan observations. BIGHIT may release official profiles later to clear up confusion.
CORTIS member specifications
Five members, one pattern: BIGHIT has not published a formal specification sheet, but fan databases provide approximate data.
| Name | Birthday | Age (2025) | Nationality (fan-reported) | Rumored Position |
|---|---|---|---|---|
| Martin | 2008-03-20 | 17 | Korean-Canadian | Leader, Main Rapper |
| James | 2005-10-14 | 19 | Thai-Taiwanese | Lead Dancer, Visual |
| Juhoon | 2008-01-03 | 17 | Korean | Sub Vocalist |
| Seonghyeon | 2009-01-13 | 16 | Korean | Lead Vocalist, Dancer |
| Keonho | 2009-02-14 | 16 | Korean | Maknae, Lead Vocalist, Centre |
| Group | — | Avg ~17 | Mixed | Unconfirmed |
Sources: Kpop Profiles – fan database; Famous Birthdays – aggregated data
Confirmed facts
- Group name: CORTIS (Kpop Profiles – fan database)
- Member names: Martin, James, Juhoon, Seonghyeon, Keonho (Kpop Profiles – fan database)
- Agency: BIGHIT MUSIC (Kpop Profiles – fan database)
- Debut year: 2025 (Kpop Profiles – fan database)
- EP: GREENGREEN released (Kpop Profiles – fan database)
- Instagram: @cortis (13M followers) (Kpop Profiles – fan database)
What’s unclear
- Exact birth dates and ages (not officially confirmed)
- Official positions
- Exact heights
- Nationalities of all members
- English proficiency levels
- Fandom name
For fans just meeting CORTIS, the confirmed details are enough to start, but the unknowns create a gap that BIGHIT will likely fill with official profiles as the group ramps up promotions.
For a similar breakdown of another global K-pop group, check out the KATSEYE member profiles for names, ages, and positions.
Frequently asked questions
What is CORTIS?
CORTIS is a five-member boy group under BIGHIT MUSIC, debuting in 2025. The name stands for “Color Outside The Lines” (Famous Birthdays – celebrity data).
When did CORTIS debut?
CORTIS debuted on August 18, 2025, with the single “What You Want” (Kpop Profiles – fan database).
How many members are in CORTIS?
Five members: Martin, James, Juhoon, Seonghyeon, and Keonho (Kpop Profiles – fan database).
What is the fandom name of CORTIS?
BIGHIT MUSIC has not announced an official fandom name for CORTIS as of 2025 (Kpop Profiles – fan database).
What are the official positions of CORTIS members?
No official positions have been announced. Fan resources assign roles based on content observation (Kpop Profiles – fan database).
Where are CORTIS members from?
Martin is listed as Korean-Canadian, James as Thai-Taiwanese, and Juhoon, Seonghyeon, and Keonho as Korean, according to fan profiles (Kpop Profiles – fan database).
Does CORTIS have any English-speaking members?
Martin is fluent in English, and James is frequently heard speaking English in group content (YouTube – fan video).
What is the latest release from CORTIS?
Their second EP, titled “GREENGREEN,” is their most recent release (Kpop Profiles – fan database).
For anyone tracking K-pop’s next generation, CORTIS represents BIGHIT’s first boy group in six years. The unknowns make it a topic of intense fan speculation, but the confirmed facts — five members, a 2025 debut, and a clear global goal — are solid ground to stand on. The choice for fans is simple: wait for official profiles, or dive into the community-curated data that is already filling the gaps.
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Hannah Walsh is Municipal Affairs Editor at Toronto Post, covering city hall, councils, transit and urban policy across the GTA.