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In his previous life, Chi Yu's childhood sweetheart unfortunately suffered from leukemia on the eve of the college entrance examination. The girl who always had a warm smile and walked side by side with him for countless days and nights was now lying on a cold hospital bed, fighting against the disease. In despair and helplessness, Chi Yu tried to raise funds through online platforms from his classmates and even all walks of life, and raised enough money to treat leukemia. However, fate seems not to let this poor girl go easily. On a sunny summer day, the girl left this world forever with her unfinished dream. On his deathbed, Chi Yu's childhood sweetheart Shen Qinxi left him a clue, asking him to investigate the classmates in her class. With this last wish, Chi Yu cheered up from his grief and vowed to solve the mystery and avenge Shen Qinxi. On the road of pursuing the truth, Chi Yu took every step step by step and was extremely cautious. But just before he was about to investigate the truth. A car accident left him lying in a pool of blood. Chi Yu's life was buried forever on that snowy night. Perhaps it was a gift from fate. When Chi Yu opened his eyes again, he found that he had returned to the year before his childhood sweetheart fell ill. This time, with the memories of his previous life, Chi Yu is determined to change everything...