One day, Yang Li received a letter from a person named Zhang Wen from afar. He didn't know why he felt a sense of resistance to others, but not to Zhang Wen. After that they got to know each other as believers. Over time, Yang Li developed a special affection for Zhang Wen. She thought her friendship with Zhang Wen would last forever. Until one day she told Zhang Wen that she was in love, fell in love with a boy named He Hao, and then Zhang Wen slowly withdrew from her life...