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When he was seventeen years old, Lin Wan sent a letter to his father and never returned home. After five years in prison, she learned three things: don't cry, don't explain, and don't forget. On the day she was released from prison, she changed her name to Song Shiyi. She wanted to find out her father's death and the whereabouts of the letter. Before his death, his father left his last words - "Back of page two". For eight years, she went through all the documents and still couldn't find the answer. Until one day, she found the string of numbers in her prison number.