What does raenseonsaengnim mean in Korean?

랜선생님 Raenseonsaengnim

Also written: 랜선 선생님

Meaning

An anonymous online teacher — a comment that actually rewires you.

When
Appeared around 2024, peaked around 2025
Heard in
comments, YouTube, daily life
Feels
positivity, realization
Politeness
Casual. Fine with friends and online; skip it in formal writing or with people you should be polite to.

How Koreans use Raenseonsaengnim

  • 댓글창에서 랜선생님 만남.

    Met a raenseonsaengnim in the comments.

  • 랜선생님 한 마디에 정신 차림.

    One line from a raenseonsaengnim snapped me out of it.