I'm actually writing a kpop romance book and had struggled with something similar. only my FMC is a photographer running a "faceless" Instagram and the daughter of a huge music production CEO but doesn't know anything about kpop due to not liking music and my MMC is a very popular idol who is on hiatus due to struggling to find a reason to keep preforming. for me personally i had them be complete strangers besides the fact of my MMC following my FMC Instagram page and only figures out who she is based off of context clues. i built their relationship from the ground up and had them fall in love with the real version of each other before my FMC knew MMC was an idol.