Xu Jingshu from the second grade class one was cold and didn't talk much. If she hadn't been punished by the teacher for every math class, she probably wouldn't have had much of a presence in class. The transfer student Chu Youning appeared and he was attracted by her sweet smile. Hence, one afternoon, someone saw the scholar-tyrant Chu Youning teaching Xu Jingshu mathematics in the self-study room upstairs.