Yeah, that occurred to me after I posted, lol. But maybe no one cared anyway, so...
Well, here: Hogu's Love.
I feel like there must be some other obvious ones, but nothing else is coming to mind. It's the unknowingly part, probably. It's not a perfect fit; one character must at least suspect that the other one likes him/her, and the other is not really pining, but definitely wants them to be together (and thinks there's no chance).
Which probably makes no sense ;)