1. What does it mean?
덕업일치 combines fandom or enthusiastic interest with professional work. It describes doing paid work in a field you already love, such as a devoted game fan becoming a game designer. It is about the overlap, not necessarily employment by an idol agency.
Also written or said as deogeomnilchi
2. The nuance
Loving a subject does not mean every part of the job is enjoyable. The term can express genuine satisfaction or the ideal someone hopes to reach.
3. Examples
“책 좋아하더니 출판사에 갔네, 덕업일치다.”
You loved books and joined a publisher: your passion became your work.
“덕업일치여도 마감은 여전히 힘들어.”
Even when your job matches your passion, deadlines are still hard.
Sources
References support the meaning and usage. Example sentences are written for NoCapWiki.