share time: 2025-06-19 02:30:17
Rigid math teacher Lin Yan finds his locked chalk box short every day after cleaning duty, until he catches intern teacher Su Qing doodling smiley faces. Protecting her passion, he hides her 'vandalism' with complex equations, sparking forbidden chemistry that ignites under the dean's disapproval. When final grades collapse, the empty chalk box triggers explosive confrontations. The stormy-night equation he writes across her palm holds more than symbols – it's the answer to a thirty-year unsolved theorem and the key to their locked hearts, written in the dust of time.
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02:19:33
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