1. What does it mean?
In online conversation, 현생 means the life outside the activity being discussed: studying, work, chores, and other commitments. 현생 복귀 describes returning to those responsibilities after time spent on a hobby.
Also written or said as 현실 생활, 현생 복귀, hyeonsaeng
2. The nuance
It need not mean everything offline; an online class or remote job may still count as 현생. This is a casual contrast with leisure or community activity, not a claim that friendships made online are unreal.
3. Examples
“이번 주는 현생이 바빠서 길드 모임에 못 들어가.”
Real life is busy this week, so I can't join the guild meetup.
“공연 잘 즐겼으니 이제 현생 복귀해서 밀린 빨래부터 해야지.”
I enjoyed the concert. Now it's back to real life, starting with the laundry.
Sources
Start Better Life: Korean expressions
References support the meaning and usage. Example sentences are written for NoCapWiki.