1. What does it mean?
과몰입 combines excessive with immersion. Fans use it for being intensely caught up in a story, character, game, or imagined scenario, sometimes knowingly exaggerating their own feelings.
Also written or said as gwamollip
2. The nuance
It can be playful enthusiasm or genuine concern about balance. The slang label is not a diagnosis, and enjoying a story strongly does not mean someone cannot distinguish it from reality.
3. Examples
“드라마에 과몰입해서 두 인물이 화해하길 계속 바랐어.”
I got so invested in the drama that I kept hoping the two characters would reconcile.
“오늘은 경기 결과에 과몰입하지 말고 편하게 보려고.”
I'm trying to watch casually today instead of getting too wrapped up in the result.
Sources
References support the meaning and usage. Example sentences are written for NoCapWiki.