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The novel uses a tragic murder of a girl that happened in school as a clue. When the investigators were looking for the suspect, they visited and investigated many times in order to clarify the details of the case. As a result, they made an unexpected discovery with an ordinary female dormitory administrator. As the case developed layer by layer, , the detectives suddenly discovered that there was an inexplicable and unexplainable relationship between the middle-aged woman and the victim girl. What had happened between them, what happened later, and how many unknown and tragic truths were hidden behind the murder...