Korean Ballad singer Ko-Yoojin sang She's gone. He was a tenor before a singer. I think this video is not well : powerful but not good.(He sang too loudly , and it sounds just zzzzzzzzzzzz.)
Hey, give the guy a break! This was some years ago, when the Flower group members were much younger, and they still had a lot to learn. You should hear him now. Try typing a video called Endless into the search bar and then see what you think.