After her father’s sudden death, 23-year-old Do-a’s life falls apart when her once-loving stepmother, Hwa-kyung, seizes the family fortune and reveals her cruel true nature. When Do-a learns that Hwa-kyung plans to start a new life with a younger man, Moo-young, she decides to take revenge by stealing his heart. She joins his company as an intern and deliberately approaches him, but soon discovers that Moo-young is not Hwa-kyung’s willing lover—he is being manipulated and used to do her dirty work. What begins as a calculated seduction turns into genuine attraction as Do-a and Moo-young uncover each other’s wounds. United by love and a desire for freedom, they join forces to expose Hwa-kyung, reclaim what was stolen, and bring her down once and for all.