Cho Sunghyun, after a tragic loss of his daughter Chaeyoon, finds himself back in time a decade. Determined to alter fate, Sunghyun forsakes his musical career to focus on being a devoted father, engaging in daily routines like driving Chaeyoon to preschool and preparing meals. However, his world is shaken when Chaeyoon reveals an exceptional talent in playing the piano by ear and singing flawlessly. Caught between his past regrets and uncertain future, Sunghyun grapples with the dilemma of whether to encourage Chaeyoon's musical gift or stifle her potential.