actually, they do sing, it look me time to figure it out, but the 4 main dancers sing in the chorus and in the bridge, wewe can hear a very distinct voice from them. in the first chorus wewe hear sooyoung, in the sekunde chorus wewe hear sooyoung and yuri, in the bridge wewe hear sooyoung, yuri, yoona and hyo, and in the third chorus wewe hear hyo again.
I NEED A TIME MACHINE~~ i'm a ballad lover, hehe.. this song is perfect.. i upendo it soooo much.. i heard that it was about -1C when yoona's cry scene.. yoona's acting.. JJANG!!