Writer Hao Fan, actress Lu Huier, and wealthy second-generation Chen Siyu, three former classmates were tied up in a RV. They thought it was someone's prank, but a gunshot shattered all suspicions. The three people who failed to escapeThey were taken to a desolate and bloody abandoned factory, where they witnessed the tragic death of their friend Pang Fu, who was covered in blood. The suffocating scene, the rotating trials of mysterious people, all contribute to this bondageThe mystery of the frame is getting bigger and bigger. What is the mystery waiting for them to reveal after a nightmare like experience of Chen April's tragic death, Lu Huier's disfigurement, and Hao Fan's forced murder?