A drama about the turbulent life story of twin sisters who are destined to meet again at the edge of despair. Do Hae Gang is an ambitious and successful, though morally ambiguous, attorney whose marriage suffers after her child dies. As the married couple drift apart, the husband Choi Jin Eon has an affair with grad student Kang Sul Ri. Pushed to the breaking point, Hae Gang and Jin Eon divorce, and Jin Eon leaves for America with Sul Ri. Hae Gang loses her memory after a car accident designed to kill her twin, and ends up living as her unknown twin sister, Dokgo Yong Gi, for the next four years. Baek Suk, Sul Ri's brother and Yong Gi's high school classmate, lives with and falls in love with Hae Gang as Yong Gi. But when Jin Eon returns to Korea and finds a warm-hearted Hae Gang who has forgotten him, he has a change of heart...