Aspiring young detective Xiang Li Xiqi takes on the case of a stolen research paper at school. With help from his friend Ren Shirou, he investigates a web of clues and classmates’ suspicious actions. As doubts rise, Xiang must rely on his sharp instincts to uncover the truth and prove himself.

By giving non-traditional answers, Pi Pi Lu is seen as a disruptive student by his teacher, Ms. Xu. In her view, only tamed students could be good students. One by one, all students become tame rabbits under Ms. Xu's encouragement and education. Pi Pi Lu is the only one in the class who refuses to be a rabbit. Can Ms. Xu's all-rabbit-class dream come true?