The film embodies a series of events by Hai Gang, who works as a successful lawyer. During this period, her relationship with her husband, Jin Eun, seems to have deteriorated. Over time, Jin-Eun encounters Seol Rye who enrolled in the same graduate school but Hye Jung has an accident and suddenly loses her memory. Baek Seok is in a big challenge as she decides to live as her youngest twin sister, Yong Gi.