Iron Family follows the story of the Cheongryeom Laundry family, who have run a laundry business for three generations. The family finds themselves entangled in a complex web of secrets and financial struggles when they discover a way to iron out their life's difficulties using money. The narrative explores the tension between the desire for wealth and the importance of family bonds. The series centers on Lee Da-rim, the youngest daughter of the family who suffers from a progressive vision impairment. Her life takes a dramatic turn when she reunites with Seo Kang-joo, a man from her past, leading to a rekindled connection that challenges their perceptions of love and responsibility. As the family navigates various conflicts, they must decide what truly matters when faced with the temptation of sudden fortune.