Unofficial fan site · made by a COER
CORTIS are a five member group under BIGHIT MUSIC who write, produce and choreograph their own music. Martin, James, Juhoon, Seonghyeon and Keonho. This is where all of it is kept.
Who they are
CORTIS is short for Color Outside the Lines. They debuted under BIGHIT MUSIC on 18 August 2025, and the name is the whole mission statement: thinking freely and refusing to stay inside the boundaries handed to you.
What makes CORTIS different from most groups is that they are a self producing creator crew and they actually mean it. They write, they produce, they choreograph, they sit in on the visual direction. Martin had writing and producing credits for ILLIT, TXT, LE SSERAFIM and ENHYPEN before CORTIS had even debuted. Their fandom is called COER, from COR in CORTIS and the ER for the people who stand with them.
The five
MartinLeader and producer.
JamesThe oldest. Performance and visual direction.
JuhoonProduction, and the dorm’s resident reader.
SeonghyeonProducer and hook machine.
KeonhoThe maknae. Vocals and dance.
The music
September 2025 · debut
May 2026
Every one of those has at least one CORTIS member in the writing or producing credits. If you want the sound broken down: songs like REDRED, songs like FaSHioN, and our review of Motion feat. Juicy J.
Latest
Magnetic, Deja Vu, GoodBoy and four more, credit by credit.
Read it
FL Studio for Martin, Ableton and Pro Tools for the mix.
Read itWhat each member reads, and what was found in their hideout.
Read it01
Who the group is, what the name means, and why this site exists. Read the About page.
03
How well do you actually know them, and which member would be your best friend. Take a quiz.
Enjoying Cortis & COERs?
Everything here is free and made by one COER: the member profiles, the quizzes, the COER ID generator and every list. A small donation helps keep it going.
