Hyunwoo was a seasoned member of an idol band about to debut, but after a severe accident on set left him scarred, he abandons his dreams of stardom and becomes an idol trainer. Bitter about his current trajectory, he wishes for time to turn back... and after a plane crash, it does! Suddenly, he’s nineteen again, with no scar in sight, a huge audience watching his group compete for the top spot on a music talent show, and loads of stage experience from his trainer days. Will he lead his group to fame or fade from the spotlight once again?