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, 당신 can hear a very distinct voice from them. in the first chorus 당신 hear sooyoung, in the 초 chorus 당신 hear sooyoung and yuri, in the bridge 당신 hear sooyoung, yuri, yoona and hyo, and in the third chorus 당신 hear hyo again.
I NEED A TIME MACHINE~~ i'm a ballad lover, hehe.. this song is perfect.. i 사랑 it soooo much.. i heard that it was about -1C when yoona's cry scene.. yoona's acting.. JJANG!!