I totally get it! I had something similar with the drama Autumn’s Concerto, but with a spoiler tag: HIV (Spoiler)
A character has HIV (human immunodeficiency virus), which contributes to the story's narrative.
It should have been a big deal in the drama. Still don’t know for which character the tag was, also it’s possible that a tag is false and shouldn’t be there.
Update: Just checked the tags for Autumn’s Concerto again and the tag seem to have been removed.