The female lead is a rich heiress, and her family insists on an arranged marriage with the male lead’s family for a business alliance, which she refuses. Years ago, the male lead had a brief encounter with her, but she doesn't remember him. However, he has always regarded her as his first love. Not wanting to miss the opportunity for this business marriage, the male lead arranges a contract where the female lead is the primary party. Faced with pressure and manipulation from her family, the female lead reluctantly agrees to the marriage. Later, the female lead accidentally joins the male lead's company as an employee. The male lead is always at her beck and call, and she begins to develop feelings for him, despite him being her superior. Just as he plans to confess that he is the one she is married to, a scandal erupts, with the female lead being labeled as a mistress. Their relationship falls into turmoil, and the female lead decides to leave the company and start her own career. The male lead secretly protects her. As her career flourishes, the female lead considers whether to annul the marriage. The male lead is desperate. At a crucial moment, a female antagonist impersonates the wife and humiliates the female lead. The male lead steps in to clarify the situation, revealing his true identity. Finally, the male and female leads break free from their business marriage and start a genuine romantic relationship.