Whee I'm happy :D

You see, some time ago (during YAWP rehearsal, actually), someone started playing a song on the piano and it sounded really familiar, but while I could sing it I couldn't recognise the song. I did have a vague notion that it was a Kpop song, though.

NOW I'VE FOUND IT YAY (but I can't believe I couldn't remember! It's so...overplayed. :/)