In Ha, the son of a gifted pianist, dreams of taking over his family's legacy. But his world is turned upside down when his father reveals an illegitimate son, Ji Ho, and names him the heir instead.
Behind the scenes, In Ha's mother plots revenge. While pretending to be a loving stepmother, she manipulates Ji Ho for her own gain.
Ji Ho, a piano prodigy, grows up believing in the love of his new family — caring for them more than himself. But when the truth about their betrayal comes to light, Ji Ho's love turns to fury. Now, he sets out to take back everything he lost — and make them pay.
