My Younger Sister Was a Genius

Yoon Hajoon gets a second chance to pursue a different future after returning to the past with regrets over his failed musical career and the family he sacrificed along the way. As he struggles with his own uncertain talent, Hajoon realizes that his younger sister is a musical genius. He decides to turn his life around by helping her become the best singer. His new ambition is to guide her talent toward a future he could not achieve for himself.