Champion of mixed martial arts of women 'Shin Eun Hye'. The strongest woman in the world, but she is too lonely because she doesn't have a boyfriend by her side. Men are reluctant because she is a martial arts champion and does not resemble a woman at all. When he is in the street thinking, he suffers an accident in a car. ... But when he opened his eyes, all the toned muscles disappeared, did he become a beautiful girl? The most powerful girl in the world!