In the library of Municipal No. 1 Middle School, Lin Chuxia, a liberal arts student, has a secret: she has been silently following Su Ming, a top science student, for three months. This seemingly hopeless secret love took a turn because of a forgotten notebook - Lin Chuxia found poems mixed with physical formulas in Su Ming's notebook, as well as observation records about "her". As she penciled her response in the margins, two parallel life trajectories began to curve toward each other.
