Essentially...
Two girls like the same guy but only one of them will find love in the end. The other must end without having any romantic resolution.
Thus far, It's Okay to Not be Okay seems to be the only one who adheres to the criteria and I'm not 100% sure.
TL;DR: I need a drama where the only person interested in either of the FLs is the ML. If there's a SML, he's not interested in the girls the ML has to choose from. There's no second guy interested in FL (even if FL isn't interested).
Optional: more than two girls into the same guy. Once more, this should wrap up with at least one of the girls going affectionless.