I wonder what it would be like to be associated with a famous act, yet ignored other than by hyphenation to that famous person/song.
Thunder of MBLAQ, every year Merry Christmas in Advance charts well for few weeks, but credits are to IU.
Jang Yi-jeong, Friday remains a popularly charting song, but at least JYJ became a BTS producer.
High4, again Not Spring, Love or Cherry Blossoms remains well loved,
Do these people get royalties from the success of the song, even if fame/credit has evaded them?
Industry of course has a lot of failures, before debut, after debut etc., but to be a part of a popular release, yet a failed career, that is another stage.
Are there other such cases in Kpop?
Popular songs arising from a collaboration - but one of the collaborators have faded into obscurity.