Go Eun-sung's life is similar to Cinderella's. After her father died, her step-mother, Baek Sung-hee, took away all of her assets and her younger brother, Eun-woo, suddenly disappears without a trace. Despite this, Eun-sung preservers and works really hard to fulfill her dreams. When the CEO of a food company, Jang Sook-ja, suffers amnesia and can't remember who she is Eun-sung takes her in. However, Eun-sung does not know that she is the grandmother of Sun Woo-hwan, the man who she switched bags with at the airport. How will their constant bickering lead them to realize that they care more about each other than they let on?