Yun Ha-Jun, who struggled to pursue his musical career despite his iffy talents 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 woke up and found himself had returned to the past. Just then, it dawned on him. The fact that my younger sister is a musical genius...! Now is the time to turn my life around, by producing my younger sister into becoming the best singer!
 
(Source: Naver, translated)

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