Newbie teacher Ling-shen’s first day at school coincides with a student’s accidental death at home. As Shen gets dragged into one after another “accidental” brutal deaths, she begins to unveil the seemingly happy and vibrant campus. Shen discovers the Hua-qing Student Club, a group of attractive and intelligent elite students, was involved in the bizarre “Mobile App Serial Murders” due to a prank-gone-wrong from years back. And the real trigger-pulling mastermind turns out to be someone Shen least expects…