Kim Ha-na realizes she has become an extra in a romance novel where Chun Nam-joo, a business heir, faces tragedy after his fiancée is found poisoned. To protect herself, Ha-na proposes a contract marriage with Chun Nam-joo, but he remains suspicious and dismisses her without explanation. Amid rising tension, Han-na learns she unknowingly took out a large loan in his name, worsening their conflict. Despite her attempts to change fate and rewrite the story's unhappy ending, Chun Nam-joo resists, leaving Ha-na questioning if she can truly alter their doomed path.