In Ha (Ji Chang Wook) is the son of a talented pianist, and dreams of taking over his family's business. But when one day his father brings home an illegitimate son, Ji Ho (Joo Ji Hoon), and declares that he will be the heir to the family business, In Ha’s world is shattered. In Ha's mother hereby want's revenge and uses JiHo, while playing the goodnatured mother in front of him.