Seryeon lives trapped in her home due to depression and panic disorder. One day, her neighbor Woo-jae tells her that her husband Ki-tae has married Chae-a, a politician’s daughter. As her medication’s side effects fade with Woo-jae’s help, Seryeon’s memories slowly return. She realizes Ki-tae killed Woo-jae’s lover Da-yeon and even tried to kill her. Regaining the truth, Seryeon and her first love Woo-jae begin their revenge against Ki-tae.