CORTIS Members Guide: Meet Martin, James, Juhoon, Seonghyeon & Keonho

If you recently discovered CORTIS, one of the first questions you probably have is simple:

Who are the CORTIS members?

CORTIS is a five-member K-pop boy group under BIGHIT MUSIC, consisting of Martin, James, Juhoon, Seonghyeon, and Keonho.

But CORTIS is a little different from a group where fans only focus on fixed positions such as vocalist, dancer, or rapper.

From the beginning, the members have been introduced as young creators who participate in music, choreography, performances, and visual content.

So instead of simply memorizing positions, a better way to meet CORTIS is to understand what each member brings to the group's creative identity.

Here is a beginner-friendly introduction to all five members.

Meet the Five Members of CORTIS

MARTIN

Martin is one of the members most closely associated with CORTIS' music-making identity.

Even before the group's debut, CORTIS spent a long period developing its own sound. According to BIGHIT MUSIC, the members worked on more than 300 songs over approximately two years while preparing their first EP.

Martin's involvement is especially visible on Lullaby, where he took a leading role in producing the track, with James and Seonghyeon also contributing.

For new fans interested in the creative side of K-pop, Martin is therefore an interesting member to watch.

Rather than seeing CORTIS simply as performers receiving finished songs, following Martin helps reveal how closely music creation is connected to the group's identity.

JAMES

James is another member who demonstrates the group's emphasis on creative participation.

He contributed to the creation of Lullaby alongside Martin and Seonghyeon, while the group's broader debut project involved all five members in music, choreography, and visual production.

That creative approach fits the philosophy behind CORTIS surprisingly well.

The group's name comes from the phrase:

COLOR OUTSIDE THE LINES

It represents the idea of thinking freely instead of remaining inside boundaries created by others.

For fans who enjoy personality, performance, and the creative process behind K-pop, James is worth watching as CORTIS continues to develop.

JUHOON

Juhoon is part of CORTIS' creative lineup and participated in the group's debut material.

Martin, Juhoon, Seonghyeon, and Keonho are among the members credited on GO!, while all five members contributed across the group's debut project.

Juhoon's official profile lists his birthday as January 3, 2008.

As you watch more CORTIS performances, Juhoon is another member who helps demonstrate why the term Young Creator Crew is important when understanding the group.

The members are not presented simply as people performing someone else's concept.

Participation itself is part of the CORTIS concept.

SEONGHYEON

Seonghyeon is another member with visible involvement in CORTIS' music.

He contributed to Lullaby and is credited on other debut material as well.

According to CORTIS' official profile information, Seonghyeon was born on January 13, 2009.

What makes following Seonghyeon interesting for new fans is how his role fits into the larger CORTIS philosophy.

The group places a strong emphasis on experimentation and making creativity feel natural rather than overly calculated.

That relaxed but creative approach has become one of CORTIS' recognizable characteristics.

KEONHO

Keonho completes the five-member CORTIS lineup.

His official profile lists his birthday as February 14, 2009.

Like the other members, Keonho has participated in the creative side of CORTIS' work and is among the members credited on GO! from the group's debut project.

He has also communicated directly with fans through official fan platforms, giving international fans another way to discover the personalities behind the music.

Why CORTIS Doesn't Fit Neatly Into Traditional K-pop Positions

If you're new to K-pop, you may expect every member guide to contain labels such as:

Leader
Main Vocalist
Main Dancer
Rapper
Visual

But CORTIS is particularly interesting because its public identity places much more emphasis on collaboration and creation.

For their debut project, the members participated across areas including music, choreography, performance, and visual production.

That makes it more useful for new fans to ask:

Who works on the music?
Who participates in choreography?
How do the members influence the visual concept?
How does each member's personality appear in their work?

These questions can tell you much more about CORTIS than a simple position chart.

From COLOR OUTSIDE THE LINES to GREENGREEN

CORTIS debuted with the EP COLOR OUTSIDE THE LINES.

The project introduced songs including:

GO!
What You Want
FaSHioN
JoyRide
Lullaby

The members worked on hundreds of songs during their preparation period before narrowing the material down for their debut project.

By 2026, the CORTIS story had moved into another chapter with GREENGREEN.

For a new fan, these releases provide a useful way to understand how the group's music and creative identity have developed.

Start with COLOR OUTSIDE THE LINES if you want to understand where CORTIS began.

Then explore GREENGREEN to see how the group's sound and creative approach continued to evolve.

What Makes the CORTIS Members Different?

One of the easiest mistakes new fans can make is trying to understand CORTIS only through traditional idol positions.

A better approach is to watch how the five members work together.

Music, choreography, fashion, performance, and visual storytelling are all connected to the group's identity.

That is why the phrase Young Creator Crew is useful when describing CORTIS.

They are performers, but creativity is also part of what audiences are being invited to follow.

Which CORTIS Member Should You Start With?

There isn't really a correct answer.

Instead, start with what interests you.

If you love the production side of K-pop, pay attention to the members' songwriting and production credits.

If you enjoy dance, watch their performance videos and dance practices.

If fashion interests you, explore the visual world surrounding songs such as FaSHioN.

And if you want to understand how the members interact away from performances, official behind-the-scenes and fan content is a good next step.

Eventually, you may discover that understanding CORTIS is less about choosing one member and more about watching how the five members create together.

Final Thoughts

Martin, James, Juhoon, Seonghyeon, and Keonho make up CORTIS.

But learning five names is only the beginning.

What distinguishes CORTIS is the group's idea of five young people participating in the creation of their own music, choreography, performances, and visual storytelling.

That's why Young Creator Crew has become an important phrase for understanding the group.

If you have just discovered CORTIS, start with the members, listen to COLOR OUTSIDE THE LINES, move on to their newer music, and then explore their performances and behind-the-scenes content.

You'll quickly understand why so many K-pop fans are watching what these five creators do next.

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