What happens when a marriage grows cold? Do Hae Gang is a successful attorney whose marriage is suffering because she puts her career ambitions ahead of her husband, Choi Jin Eon. As the two drift apart, Jin Eon meets Kang Seol Ri, a grad student who reminds him of how his wife used to be earlier in their relationship before she became so consumed with career advancement. Hae Gang then gets into a car accident and loses her memory and assumes the identity of her younger twin sister, Yong Gi, who then falls in love with Baek Seok. What will happen to Hae Gang and Jin Eon’s marriage now?