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Cheng Ye, who was experiencing ups and downs in the city, suddenly received the news of his grandfather's death. According to his grandfather's will, Cheng Ye must return to the countryside to help his grandfather fulfill his wish. On that cold winter night, Cheng Ye inexplicably met a girl who called herself "Butterfly" and said that only by cooperating with him could he help his grandfather fulfill his wish. The gears of fate began to turn, and the bond between the two deepened one incident after another. From winter to summer, Cheng Ye gradually understood that everything started from a legend.