this is BAD. First of all remove the romance tag, 14 chapters in and NO hint of romance and I don't even want the romance between MC and FL considering their current dogshit relationship.
Now about the characters, almost all female characters are extremely selfish INCLUDING the FL. The MC is dumb af and has no will of his own, bud creates great songs for free for FL for no reason, even though he was offered by a bigger idol who is ready to pay a lot and one of his song got famous through her. The best friend of FL is a bitch. Story also lacks side characters, there are basically no male characters other than the MC.
About the "idol" part, the females are just idol in name. FL hangs around with the MC publicly without a care, does all kinds of stuff. They are nothing like Idols, and if they wouldn't act like this if they took their career seriously.
I would rate this a solid 2.5/10, don't waste your time for this crap unless you just want fanservice and get baited