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Lin Mu is an ordinary girl, but her life is not like that of an ordinary person, but she does not live like a big shot. "Mumu, your father and I are divorcing, you..." "Oh, I'm an adult and I don't follow anyone." "Sister Mori, who is that person? I've been with you for a long time, why don't you come to say hello?" "I don't know, I don't know, I don't know." "Classmate Lin Mu, you and Xiao Ran can participate in this competition together. I know you can do it." "Um, am I not a bad student? Are you serious about the math competition?" Lin Mu looked at this "childhood sweetheart" recalled from the depths of his memory and fell into deep thought...