Zhao Qiangzi (Kim Hee Sun) used to be a bad girl who was feared by everyone. Now, she has already "washed her hands in a golden basin" and has hidden all her edges and become a mother. What Zhao Qiangzi didn't expect was that his daughter Wu Yalan (Kim Yuzhen) became a victim of school violence. What made Zhao Qiangzi even more sad was that when she encouraged her daughter to seek justice for herself, her daughter chose to remain silent. Zhao Qiangzi, who never played by the rules, came up with a plan. In this way, she entered her daughter's class and became her classmate. The campus life full of conflicts kicked off, and Zhao Qiangzi, who wanted to solve the problem, became the biggest problem himself. Here, Zhao Qiangzi needs to face not only the criticism and pressure from the students, but also accidentally discovered the unspeakable secrets of the school consortium.