Hae-Gang is a successful lawyer, but she wants to become more successful. Due to her ambitions, her relationship with her husband, Jin-Eon, deteriorates. At that his time, Jin-Eon meets Seol-Ri who attends the same graduate school. Her personality is pure and enthusiastic, like his wife Hae-Gang had in the past. Hae-Gang then has an accident and loses her memory. She meets Baek Seok and live as her younger twin sister Yong-Gi.