On graduation day, Shen Tingxue announced chartering a plane to an overseas villa, collecting phones, and a 24-hour internet blackout challenge. All 29 students in the class joined in, but only Gu Mian sensed something was wrong. After her dissuasion failed, Gu Mian refused to go, asked Tang Ning to hide a backup phone, and went to her advisor's experimental group. Upon landing, she received a cry for help from Tang Ning. Security officer Wang Qiang took charge of the investigation, but rescue efforts stalled. Coincidentally, Shen Tingxue sent another invitation. To save her classmates, Gu Mian agreed to the invitation. Through numerous hardships, Gu Mian and her classmates were rescued, and Shen Tingxue was arrested.