"Iron Girls" is a new tvN entertainment program that features Jin Seo Yun, Uee, Seol In Ah, and Park Ju Hyun challenging a triathlon. The triathlon that the four will challenge is a sport that requires swimming, cycling, and marathon without stopping, and is an event that requires extreme physical strength and strong endurance. The four people's challenge and passion will be conveyed through "Iron Girls". (Source: Korean = Naver)