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Because his friend broke the appointment, Lu Zhongyi got on the train to Tibet alone. After going through a lot of hardships, the trip ended in vain. After returning to school, Zhong Yi dictated it and his friend Meng Keke recorded it, creating a story about a long journey. "White Zhongyi" representing the real world and "Black Zhongyi" symbolizing the fantasy world alternately tell this story, but the recorder Meng Keke disrupts the boundaries between reality and fiction in the story, blending family conflicts, growing rebellion, campus conflicts and views on a strange world to achieve Zhongyi's growth and enlightenment during the journey, as well as Lu Zhongyi's fate.