Kim Ji Su aspires to be a great classical pianist just like her idol, Vladimir Horowitz. But her dreams are crushed when her family is too poor to pay for a proper education overseas. With no other options, Ji Su opens up a music studio and begins teaching other aspiring pianists. One day, she discovers a mute boy who is a child prodigy and begins to train him for a piano competition. But secrets from the boy’s past will change Ji Su’s life forever.