In order to ensure the enrollment rate during the summer vacation, a private high school organized the top 30 senior high school students to go to the life center for tutoring. Top Yan Zhirun, introverted Jin Shixi, former swimming department leader Yin Nalai and naughty JK were all on the list. Although reluctant, this group of young men and women still came to school as scheduled. During this period, their mobile phones were confiscated, and in accordance with the requirements of their teachers, they put aside all selfish thoughts and made every effort to move towards the goal of the university. The tense and boring days continued, but terrible events appeared and disturbed the children's nerves. It was during the evening self-study that the body of the young girl Lan Lan suddenly fell from the ceiling, and then came the incredible news from the radio: from now on, they will die one by one, and who will finally get out of this horrible death school? it became a problem they had to face.