Why Did BTS's RM Call Himself Olkk? (올크크)
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BTS's RM Used a Word Nobody Recognized — Until They Heard the Song
When BTS leader RM posted on Instagram and wrote that he was "올크크 (OLKK)," global fans were confused. It looked like a typo. It looked like nonsense. It was neither. The word came straight out of a song by CORTIS (코르티스), BigHit Music's newest boy group — and once you hear where it comes from, the whole thing becomes much funnier.
CORTIS Are BigHit's Young Creator Crew
CORTIS is a five-member group under BigHit Music, the same label as BTS. The members — Martin, James, Juhoon, Seonghyeon, and Keonho — are all teenagers who write, produce, and direct their own music, choreography, and visuals. Their name comes from the phrase "Color Outside the Lines," and their group identity is built around a concept they call "Young Creator Crew." That phrase became the title of one of their songs: "YCC (YOUNGCREATORCREW)."
The Song Invented a New Word: 영크크
In "YCC (YOUNGCREATORCREW)," CORTIS created a word that does not exist in any Korean dictionary: 영크크 (YEONGKK). It combines "영" from "Young" with "크크," the Korean internet shorthand for laughter — the equivalent of typing "lol" or "haha" in English. Put together, 영크크 sounds like "Young KK" and captures the idea of laughing young energy. It is playful, self-referential, and built entirely out of the group's own identity. The word runs through the entire song as a kind of anthem.
The Song Also Invented the Opposite: 올크크
The genius of the word is that it creates a natural counterpart. In the lyrics, the older generation looks at CORTIS and calls them "영크크" — young and chaotic, not to be taken seriously. But the song flips this around. The line "올크크들 모여유" appears in the track, calling out to the "OLKK crew." Here, "올" means "old," paired with the same "크크" laughter sound. Where 영크크 is the young laughing energy, 올크크 is its mirror — the older generation that is no longer young and chaotic, but is still in on the joke.
Then RM Put Himself in the OLKK Category
RM is 30 years old. He has been a K-pop idol since he was 16. When he posted on Instagram saying he was 올크크, he was placing himself on the older side of the CORTIS divide — not the young creator tearing things up, but the senior who fully understood the joke and was comfortable enough to say it. It was self-aware, funny, and unusually humble for a senior artist of his stature. Fans immediately recognized the CORTIS reference and the moment spread fast.
Why This Word Works So Well
Korean internet language often compresses a lot of meaning into very short sounds. "ㅋㅋ" alone is one of the most recognizable symbols in Korean digital culture — everyone knows it means laughter without needing any explanation. By putting "영" or "올" in front of it, CORTIS created two words that feel instantly understandable. Young laughter. Old laughter. The contrast is built into the sound itself, and no translation is needed to feel it.
A Small Moment That Crossed a Big Gap
What made RM's post land so well was the direction it traveled. A 30-year-old leader of one of the biggest groups in K-pop history voluntarily placed himself inside the slang of a teenage rookie group that debuted the year before. That kind of crossover does not happen often. For international fans, it was also a small but memorable introduction to CORTIS — and to the kind of language play that makes Korean internet and K-pop culture feel like a world worth learning.