1. What does it mean?
현강 shortens 현장 강의. Students use it for an in-person class, especially when comparing the same instructor's classroom lessons with online lectures or recordings.
Also written or said as hyeongang
2. The nuance
It means being physically present, not merely watching a live online stream. Extra materials, questions, and replay access depend on the actual course, not the abbreviation.
3. Examples
“현강은 교실 분위기 덕분에 집중이 잘돼.”
I focus well in the in-person class because of the classroom atmosphere.
“현강 갈 때는 이동 시간을 넉넉히 잡아.”
I allow plenty of travel time when going to the in-person lecture.
Sources
References support the meaning and usage. Example sentences are written for NoCapWiki.