Sing Again is a new music competition for singers who desperately want one more chance. It aims to give unknown or forgotten singers to be rediscovered by the audience. The show's twist is that the contestants are only called by their numbers: the winners only reveal his/her name to the world. The stories and performances will make the viewers moved and amazed. Let's follow the grand journey, which transforms an unknown into the next superstar. Lee Seung-ki hosts the show, and eight music experts with diverse experiences and tastes participate as the judges.