OK, I love this song. It's actually from the musical,
Jekyll and Hyde and uh...Sebastian Bach did it on Broadway once, and I was sort of infatuated with Sebastian Bach when I was a wee little thing (SHUTUPSHUTUPSHUTUP) and he performed this song on a NYC morning show or something and an audio rip of it was the first mp3 I ever downloaded ever (via Napster, lol. old school y'all) and I still have it YES. It survived many computer moves and lives happily on my ipod and I listen to it frequently.
ANYWAY. When I saw Daesung sing the Korean version, I pretty much freaked out because I LOVE THIS SONG, right, and DAESUNG'S VOICE YOU GUYS. IDK. IT'S JUST. IT DOES SOMETHING TO ME.
So tl;dr: Enjoy Daesung singing some musical theatre and rocking that shit.