Hae-gang is a lawyer who is so drawn by her ambition that she didn’t realize that her relationship with her husband was turning sour until it was too late. Jin-eon is now having an affair with a college student who reminds him how his wife use to be in the early days of their relationship. They eventually divorce, and not long after Hae-gang gets into a car accident. A man, Baek-seok, mistakes her for somebody else and comes to her rescue. As she has lost her memory and Baek-seok calls her Yong-gi, she confidently assumes this identity. She couldn’t guess that Yong-gi was actually her twin sister whom her parents have always hidden from her. Now the fiancée of Baek-seok, she lives with her family but will soon meet again her ex-husband.