Scroll any K-pop comment section for five minutes and you’ll hit a wall of slang that reads like a foreign language even in English. Here are ten terms worth knowing before you jump into the conversation.

1. Bias — your favorite member in a group, the one you’d defend in any argument.
2. Visual — the member widely seen as the group’s aesthetic standout.
3. Idol — the general term for any trained K-pop performer, singer or otherwise.
4. Stan — to support a group enthusiastically; also used as a noun for a devoted fan.
5. Sasaeng — an obsessive fan whose behavior crosses into stalking; never used approvingly.
6. Fancam — fan-shot footage following one member through an entire performance.
7. Webtoon — Korean digital comics, often adapted into the K-dramas fans cross over to watch.
8. OST — a drama’s original soundtrack, frequently featuring idol vocalists.
9. Photocard — the collectible card packed inside albums, endlessly traded between fans.
10. Aegyo — deliberately cute behavior (a pouty voice, a wink, an exaggerated pose) that fans gush over in comment sections and compilation videos.

Where These Words Come From

Most of this vocabulary didn’t originate in Korean at all — several are English loanwords reshaped by fandom, then folded back into Korean-language fan communities online. Learning them isn’t really learning Korean; it’s learning the shared dialect of the fandom itself, which turns out to be just as useful for understanding what you’re reading.