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When Lin Xiaoyu, an ordinary social worker, bought a mysterious glowing hourglass at an antique stall, she thought she was just buying a cheap gadget. However, the moment she turned the hourglass over, she was dragged back to the high school classroom in 2015 - that summer when cicadas were noisy and chalk dust was falling, with only the last month left before the college entrance examination. The hourglass can turn back time, but it seems to have hidden rules. When she returned to the past, she not only had to face the familiar math questions on the blackboard and make up for her regrets in the college entrance examination, but she also couldn't ignore the young man Chen Mo who was always lying in the last row. He was a "hopeless" poor student in the teacher's eyes, and a marginalized person who was "living around" in the eyes of his classmates. However, in Lin Xiaoyu's memory, he was a gentle presence who silently put on her school uniform and fed stray cats. From changing the solution to a question to trying to bring back the boy who was about to slide into the abyss, Lin Xiaoyu gradually discovered that the secret of the hourglass was far more than just "going back to the past". Every change comes with a price, and every revised trajectory hides unexpected forks. When she thought she was the corrector of destiny, she didn't know that she had already been involved in the vortex of time weaved by the hourglass - the past that she had deliberately rewritten was reshaping everyone's future in unexpected ways.