Iron Girls 2 follows actresses Uee, Park Ju-Hyun, Seol In-ah, and new member Geum Sae-Rok as they take on a new physical and emotional challenge: boxing. After conquering a triathlon in season 1, the cast returns Iron Girls returns with a new mission that takes the cast on their toughest challenge yet. The spotlight is on a fierce transformation from triathletes to boxers. Returning members Uie, Seol In Ah, and Park Ju Hyun reunite with a new face, Keum Sae Rok, to form a fresh lineup of determined women ready to step into the ring. Leading their journey once again is Kim Dong Hyun, whose tough-love approach pushes the cast to test their strength, stamina, and spirit. From jump rope drills to sparring sessions, the members endure rigorous training routines that challenge both their bodies and minds. With sweat, tears, and bruises along the way, each cast member confronts her limits as they prepare for a real boxing match where their hard work will be put to the ultimate test. Can the girls become boxing champions?