Jung-woo learns to play piano from a one-armed pianist who he later finds out is his mother’s old lover. His mother is paralyzed in one arm due to a brain tumor and kills herself with her old flame. Shocked, Jung-woo also attempts suicide but is rescued by Eun-su’s father and goes to live with them. Eun-su’s sister, Eun-ji has shut herself out from the world due to jealously of her sister, but slowly **begin**s to open up thanks to Jung-woo’s piano-playing. Eun-ji and Jung-woo are growing their love through piano sound with communicating by forgiveness.