Kang Won-mi, an ordinary 13-year-old adolescent girl who loves tteokbokki, sports, and cherishes friendship. Won-mi begins judo following her favorite brother, Chung-myung, and falls for the special charm of judo. However, as he learned about Cheongmyeong's feelings for him, he was greatly hurt and tried to give up even his favorite judo. It is a story about the excitement and agony of the first love, the fear of the first challenge, and the life of our children who endure failure and grow up.