Jin Seo Yeon is known for her passion for working out. She takes care of the team’s mentality and leads the girls. Uie shows how a former athlete is different from ordinary people. Since she used to be a pro-swimmer, her physical abilities are beyond expectations. Park Ju Hyun is the clumsy and the weakest of the members. However, she became passionate as the training continued. Seol In Ah is shy among the members, but whenever the whistle blows, she turns into a Sports Genius and shows off her amazing talents. Former UFC fighter Kim Dong Hyun appears as the captain of this team, and he invites other legendary athletes to get help training the members.

The never-ending challenge of those who have become iron women! They shake off their fears and stretch their fists beyond their limits! The story of the Iron Girls' challenge to become boxing champions is filled with blood, sweat, and tears.