This drama is adapted from a book of the same name.The non-existent room 302 key, the mysterious man entering and exiting the bathroom ticket gate, the doll of the relics that suddenly speaks, the shadows appearing through the glass every night, the real estate salesman who disappeared without warning, the mysterious pictures, the surviving fire, the breath of peeping from behind late at night - when looking for a house, please pay attention to the % notification matters.