Korean slang profile

랜선생님

raenseonsaengnim

Someone you do not know personally who teaches you things through online comments or similar interactions.

Expanded form: Not documented
Other spellings: —
Earliest source found: Feb 19, 2025
Documented trend period: Not verified

This is the earliest source we have verified, not the date the term was coined.

01Examples, with English translations

Example by Julimmal
모르는 문제를 댓글로 풀어준 랜선생님 덕분에 이해했어.
Thanks to the 랜선생님 who explained the problem in a comment, I understand it now.

02Documented history

2025-02-19Insight reported that Moon Sang-hoon proposed this name for someone who teaches others online.[1]

03Origin & word formation

Insight introduces a new term proposed by Moon Sang-hoon and explains it as a person who teaches others online. This is reporting on a creator’s suggested term; how widely it became established and its earliest use were not separately verified.

Evidence for the origin explanationMedium

The meaning and usage were checked directly in the article. The original material and when the expression was coined need separate verification.

04Sources

Original titles and links are preserved. An English translation does not replace the original source.

문상훈이 만든 ‘2025년 신조어’ 목록... “그럴싸한데?” 누리꾼들 반응터졌다 (인사이트)Published Feb 19, 2025Original source checked Nov 12, 2026