Fifteen-year-old Xu Jia silently fell in love with her fifteen-year-old classmate Liu Chengzhou. In her heart, her love for Liu Chengzhou was an indescribably pure and beautiful feeling. But she was afraid that others would find out, so she hid that love deeply in her heart. He has been quietly paying attention to Liu Chengzhou. But she didn't know that there was someone behind her who was watching her silently. But by the time she found out, the building was already empty and there was no time to save it. . . . . .