Yun Ha-Jun struggled to pursue his musical career despite his lackluster talent and ended up sacrificing his own family along the way. "If only I could turn back time...!" One day, after living with regrets and alcohol for a while, he wakes up and finds himself in the past. Just then, it dawns on him: the fact that his younger sister is a musical genius! Now is the time to turn his life around by producing his younger sister into becoming the best singer! (Source: Naver Corporation, translated)