Ji Oh, a senior in high school who was injured ahead of the National Taekwondo Competiton, is facing late puberty. Cha Gyeol, who met Ji Oh while having all sort of bad thoughts, is completely swoon over by Ji Oh with her dazzling smile. However, the people around Cha Gyeol are somehow dangerous for her to go head over heels with him. Her mind knows that she should be wary of him but she could not stop her interest towards Gyeol. Is it alright for herto like him?