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Lin Beixing accidentally returned to the age of eighteen, accidentally met a boy named Zhang Wansen, and learned that Zhang Wansen had been secretly in love with him, so Lin Beixing began to investigate Zhang Wansen, and learned that Zhang Wansen had lost his life for him. From then on, Lin Beixing began the journey to save Zhang Wansen. But no matter how many times he went back, he could not save Zhang Wansen. Just when Lin Beixing gave up everything and started a new life, Zhang Wansen appeared...