Ji Oh, a senior in high school who was injured ahead of the National Taekwondo Competition, is facing late puberty. Cha Gyeol, who met Ji Oh while having all sorts of bad thoughts, is completely swooned 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 in Gyeol. Is it alright for her…to like him?