According to chalk net's inquiry, Shan Shuling is a senior teacher who took the chalk public examination. Before coming to chalk, she was forced to accept sky-high class fees. But her heart is not safe. She must fight alone. She chose chalk only to ensure better course teaching and research. Because here, what can be given is given and what cannot be given is given. It's all given to students, not because knowledge is cheap, but because chalk speaks conscience. Here, she likes the sureness brought by inner peace. She likes the value brought by teamwork, she likes the persistence of students to settle down and not take shortcuts, and she likes to focus on teaching and research to be a pure good teacher.