Su Qingcheng has been in love with her cousin Su Qingguo since she was fifteen years old. Maybe Su Qingguo also liked Su Qingcheng, but as brothers and sisters, even if they fall in love, they can never be together. Xia Yan, a boy who has always been in love with Su Qingcheng, protects her from harm, but Lin Jiao, the fiancée designated by his parents, has been harming Su Qingcheng. This story unfolded in the year of Su Qingcheng's fifteenth birthday...