After losing his daughter Chaeyoon due to negligence, Cho Sunghyun plunges to his death and wakes up 10 years in the past! Vowing never to repeat his mistakes, Sunghyun gives up music to be a dad, driving his daughter to preschool and cooking for her. But what's this? Chaeyoon plays piano without sheet music and sings with perfect pitch! Who would've thought she'd be a total prodigy?! Sunghyun is conflicted, though, given his trepidation about music... Should he let her play or press pause?