Hana is murdered after witnessing her husband Jinho’s affair with her friend Yerin, but she ends up traveling back in time. Determined to get revenge, she takes a job as Dohoon’s secretary, Yerin’s fiancé, and sets out to seduce him. As she digs for information on Jinho and Yerin, she grows close to Bae Shinwoo, finding herself caught in a love triangle. After Yerin’s actions create a rift between Hana and Dohoon, she pulls away from him but, with Shinwoo’s help, uncovers the evidence that could bring down Jinho and Yerin. When Yerin kidnaps and attacks Hana, Dohoon takes the hit in her place, and Hana realizes his true feelings. Now that her revenge is complete, Hana must choose between Dohoon and Shinwoo.