"Sing Again" is a music competition for singers who are desperate for one more chance. It aims to give unknown or forgotten singers a platform to be rediscovered by the audience. The show's twist is that the contestants are called by their assigned numbers & only the winners get to reveal their names to the world. The performances & the heart touching stories behind them will move the viewers and let them experience the transcendental power of music. Along with the host Lee Seung Gi & eight judges who are music experts with diverse experiences, let's follow the amazing journey of these unknown singers who can turn into the next superstars.