Ji-o’s luck runs out when she gets injured before the tryouts for the national taekwondo team. In the middle of facing what seems to be the biggest crisis of her life, she meets Gyeol, a mysterious boy who changes her life forever. He’s the definition of a bad boy with a good heart, and she finds herself unable to resist his charms. However, she might be playing with fire as he’s someone who’s involved with the wrong crowd. Is falling for Gyeol worth the risk? 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 her…to like him?