Lee-soo, who was stripped of everything and murdered by her husband Tae-kang—who was having an affair with her stepmother—wakes up on her wedding day seven years in the past. She vows never to be a victim again. Determined to take revenge, she encounters a man named Moon Jung-hyuk, who proposes, "Let's get married once the fake boyfriend act is over. The term is six months." Through a contract born of mutual necessity, Lee-soo begins to successfully execute her revenge plan against her husband and stepmother one by one. Meanwhile, Moon Jung-hyuk, who promised cooperation under the condition of a contract marriage, cannot hide his affection for her. Lee-soo's heart, once fueled only by revenge, begins to melt little by little...