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"Quickly, get the strange stone, and Yuncang will be ours." Mu Yun looked at the way people used her blood to break the seal and fought to disown them. She vowed to get the strange stone, change people's hearts, and change the world. "Yun'er, this world is left to you." The person she loved most died in order to help her, and was stabbed to death by their most beloved elder. She was inconsolable but could only repair and continue. Even if she risked her life, she still had to protect the world. This is their belief. Three thousand years have passed, and Yuncang is still surrounded by the sound of Mu Yun's piano. The people of Yuncang are famous all over the world for their kindness and understanding. Until the best school in Yuncang, after something happened in Yuncang No. 1 Middle School, Mu Yun transformed into a student and sneaked into the school. Even though she often skipped classes, she was still first in grade. Even if she didn't do her homework, the teacher never criticized her. Mu Yun became a famous figure in the school. But people don't know Mu Yun's other identity, Xuan Yun's pavilion master, and the boss behind Xuan Yun Group. She brings more and more people with special powers under her wing to help her protect the school and the world. Until one day, she discovers the evil manipulator in the school...