One night at around nine o'clock, Xiaoyu went to watch a late movie alone. She had made an appointment with her classmates, but her friend failed to make an appointment temporarily and could not find anyone to watch with her for a while, so she had to go alone.The movie she watched is not too popular. There are not many people in the cinema and it is sparse. She doesn't like to get too close to others, so she chose the back position, and there are many empty seats in front, back, left and right.She didn't expect that this decision would put her into hell.