Fatal Final Exam

I was the invigilator for the last final exam. At the end of the exam, all 48 students died. The police immediately targeted me. But the autopsy results came out and all the students died of suicide. There was no way, I was acquitted. But three years later, a medical student found me: "Did you kill him? I already know what questions you gave the students that day." My body couldn't help but tremble—— Three years later, she finally came.