讲述失踪25年的妹妹“有真”重返家中后家人逐渐出现了变化，对此感到异常的哥哥“书振”追查妹妹隐藏秘密时发现令人惊讶事件的推理悬疑故事。
She’ve got the e-mail from him who she doesn’t know. He talk to her some memories that they loved each other. But she really doesn’t know who he is.
