could it be this? couldn't think of anything else https://www.mangago.zone/read-manga/miss_you_lucifer/
this is probably not it but in the extra mc becomes an idol and ml an actor! https://www.mangago.zone/read-manga/you_and_i_can_t_do_this/
its not but it looks interesting, i'll read this now thank you !
i've been wanting to read this one and you just gave me incentive to ! ♡
trying to remember a bl manhwa, i dont think the main story had anything to do with idols but in the extra it was an au where they became idols also ml is taller than mc ( not a focus point of the manhwa just trying to remember as many things as i can )
im sorry its not very descriptive and theres not much to go off i would describe it more if i could