Record of the Princess Lying Down

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It is a book that is a bit refreshing and sweet at the beginning, but has a knife at the end. The main plot is that the heroine was framed by her family and imprisoned. Later she became a strong woman and wanted to avenge her sister. She was slapped in the face at the end. The truth is that the hero is a man who has lived for a long time. He finds his sister and takes a knife.