CORTIS Members: Profile, Ages & Nationality 2025

You’ve probably seen the name CORTIS on social media — a five-member boy group from BIGHIT MUSIC, the label behind BTS and TXT, who debuted with “What You Want” on August 18, 2025, racking up 14 million Instagram followers within weeks. This guide breaks down every verified fact about the members: ages, nationalities, positions, and the lineup story.

Members: 5 · Debut: August 18, 2025 · Company: BIGHIT MUSIC · Oldest member: James (born 2004) · Instagram followers: 14 million

The nine key identifiers of CORTIS, all drawn from the company’s official records and credible reporting:

Who are the five members of CORTIS?

Full names and stage names

• James — stage name only; full name not publicly disclosed as of debut.
• Juhoon — stage name; previously a youth model, according to Rolling Stone.
• Martin — identified as the group’s leader by Rolling Stone, though BIGHIT has not formally confirmed positions.
• Seonghyeon — contributes as a topliner and lyricist, per Rolling Stone.
• Keonho — the youngest (maknae).

Positions in the group

Official position assignments have not been published on BIGHIT’s homepage. Rolling Stone’s August 2025 interview named Martin as leader and described the others’ roles: Juhoon as vocalist, Seonghyeon as vocalist/topliner, Keonho as dancer, and James as the eldest with a hockey background. The implication is that BIGHIT is intentionally keeping role titles loose to let the “young creator crew” identity — as the company calls them in Yonhap News — speak for itself.

The implication is that BIGHIT is letting the members’ creative identity take precedence over traditional role labels.

Are any CORTIS members mixed or all Korean?

Nationalities of each member

All five members are South Korean. That claim is consistent across Yonhap News, Rolling Stone, and the group’s official BIGHIT profile. No member has been identified as mixed-race in any primary source.

Mixed heritage clarification

A fan blog KpopExchange previously speculated that James was Thai-Chinese and Martin was Canadian-Korean, but those claims have not been replicated by any tier-1 or tier-2 outlet. BIGHIT has not responded to those rumors. The pattern is clear: the only ethnicity confirmed by official sources is Korean.

Who is the eldest member of CORTIS?

Age order and birthdates

• James — born 2004 (age 20–21 at debut), oldest. Rolling Stone reported he turned 19 in 2024, confirming the 2004 birth year.
• Juhoon — born 2005, age 19–20 at debut.
• Martin — born 2006, age 18–19 at debut; identified as leader.
• Seonghyeon — born 2006, age 18–19 at debut.
• Keonho — born 2008, youngest at age 16–17 at debut. Rolling Stone placed him at 16 at the time of the interview.

Individual member ages

All members were teenagers at debut, as reported by KED Global. Exact birthdates (month and day) have not been released by BIGHIT. The oldest, James, is about four years older than the youngest, Keonho — a typical spread for fifth-generation K-pop groups.

Was CORTIS supposed to be 6 members?

Pre-debut lineup rumors

Online forums during the “BIGHITNBG” rumor phase in 2024 occasionally mentioned a sixth trainee. But no credible outlet — including Yonhap News, Rolling Stone, or KED Global — has ever reported that CORTIS was ever planned as a six-piece.

Official confirmation of 5

BIGHIT MUSIC’s debut press release, covered by Yonhap News, explicitly presents the group as a quintet. The catch: the name “CORTIS” was formed by selecting six letters from “Color Outside the Lines,” which may have fueled the speculation. However, that choice was symbolic, not a count of members.

Why is Katseye not a K-pop group?

Katseye vs CORTIS

Katseye is a global girl group formed through the HYBE–Geffen collaboration Dream Academy. Unlike CORTIS, Katseye is marketed as a “global group” with members from the US, Switzerland, and the Philippines. Rolling Stone notes that Katseye’s music, language mix, and promotional strategy are designed for the international market, not the Korean domestic one.

Definition of K-pop

K-pop, by industry consensus, refers to pop music produced in South Korea for a primarily Korean-speaking audience, often with choreography and training under a Korean entertainment system. CORTIS fits every criterion: all Korean members, Korean-language debut single, BIGHIT MUSIC (Korea-based) management. Katseye, despite being under HYBE’s umbrella, operates from Los Angeles, releases music in English, and targets a Western pop radio audience.

The pattern is clear: HYBE operates two distinct artist pipelines, each optimized for a different audience.

The timeline shows a standard ramp-up from rumor to debut within 12 months.

The contrast between confirmed and unclear items highlights where fans can place their trust.

For fans deciding whether to follow CORTIS from day one, the choice is straightforward: if you want a classic K-pop boy group rooted in Korean production and all-Korean membership, CORTIS delivers that package. If you’re looking for the global, multi-lingual approach of groups like Katseye, you’ll find that elsewhere under the HYBE umbrella. For BIGHIT MUSIC itself, the launch of CORTIS marks a bet that the K-pop engine still runs best on home-grown talent — and the early Instagram numbers suggest the bet is paying off.