CORTIS are a five-member South Korean boy group consisting of:

Martin
James
Juhoon
Seonghyeon
Keonho

They debuted under BigHit Music in August 2025, making them the label’s next major boy group after BTS and Tomorrow X Together.

In 2026, their song “REDRED” turned them from promising newcomers into one of K-pop’s most talked-about new groups.

TikTok named CORTIS its Boyband of the Summer 2026 and positioned “REDRED” at the centre of its K-Pop Summer campaign.

What does CORTIS mean?

The group has been built around the concept of a creative crew rather than simply performers executing somebody else’s ideas.

They have become known for participating in:

songwriting
composition
choreography
video concepts
creative direction

That involvement has become a central part of their identity.

What does “REDRED” mean?

The song uses traffic-light colours metaphorically.

Green represents the direction the group wants to move toward.

Red represents things they want to stop or reject.

The track therefore becomes a youthful statement about deciding what belongs in your life and what doesn’t.

It’s not exactly subtle.

That’s part of its appeal.

Why did “REDRED” go viral?

The choreography helped enormously.

One particularly recognisable movement became known as the “wiggle ears” or “flappy ears” dance.

Short-form videos using the song spread rapidly.

Even members of BTS, TXT and ENHYPEN engaged with the dance trend.

That created an ideal K-pop discovery loop:

song
dance
fan videos
celebrity participation
more song discovery.

What genre is CORTIS?

Broadly:

K-pop
hip-hop
pop

But describing any modern K-pop group with a single genre is difficult.

K-pop frequently absorbs:

rap
R&B
electronic music
dance music
rock
trap
funk

within the same project.

“REDRED” leans heavily toward rhythmic, dance-focused pop.

Are CORTIS connected to BTS?

They aren’t members of BTS or a BTS sub-group.

The connection is the label.

Both groups come from BigHit Music.

That naturally created enormous curiosity around CORTIS from the moment they debuted.

But sharing a label also creates pressure.

Every new BigHit boy group will inevitably be compared with BTS.

The healthiest route for CORTIS is therefore developing an identity that clearly belongs to them.

How successful have they become?

Their second EP GREENGREEN arrived in 2026 and performed strongly internationally.

The group also picked up major awards within its first year, including a Record of the Year grand prize at the 2026 KM Chart Awards.

That’s unusually fast growth.

Where should new listeners start?

Try:

REDRED
What You Want
GO!
FaSHioN
TNT
ACAI
YOUNGCREATORCREW

Start with “REDRED” if you want to understand the current hype.

Then move backwards.

What makes CORTIS different?

The group’s creative involvement is probably the most interesting part.

A common criticism of K-pop is that groups can feel heavily constructed by labels.

CORTIS are deliberately positioned against that perception.

The members aren’t merely appearing in the end product.

They’re involved in making it.

Whether that approach continues as they become bigger will be one of the most interesting things to watch.

Why are CORTIS worth knowing now?

Because music discovery moves quickly.

By the time an emerging K-pop group becomes globally obvious, the early discovery phase is already over.

“REDRED” feels like that transition point.

CORTIS aren’t obscure anymore.

But they may still be early enough that millions of listeners are only now asking:

Who are these guys?