Tame the Little Devil

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There are nine teachers in the Ginkgo class, three of whom are permanent teachers: Chinese Indus, Physical Education Banyan, and Art Acacia. Mathematics teacher Bai Yang serves as the deputy head teacher of the Pinecone class next door, and only appears as a subject teacher in the Baiguo class. Who is the protagonist in Ginkgo's class? Now of course it's Teacher Wutong! Twenty years later, the protagonists must be those former demons, Wei Qianmo, Lin Wufei, Ouyang Yiyi, Luo Xiyao...