Palm Birth Wish

It was difficult for Qiao Qing'an to understand the horror of death since she was a child, until her sister who had always cared about her disappeared. For the first time, she was afraid of the connection between disappearance and death, and she soon thought of the big quarrel she had with her family before her sister disappeared. The content seemed to mention a place called the Old World Library. Just when she was distressed, she received a package containing a green jade ring and a letter. The letter only had seven words, "This is your library card," and was signed "Old World Library"...