Chen Ling, a cheerful and enthusiastic new teacher, has encountered a series of deaths since she entered the campus... and the outstanding students who seem to be excellent in both character and learning, talent and appearance, have a heinous evil character. After a long period of abuse, an incredible series of murders finally occurred. The only thing in common among these victims is that they all died in the form of specific stickers received from the communication software... and after tracing it down layer by layer, it was found that the murders were related to the accident a year ago. In the end, as Chen Ling continues to investigate, she will find that there is a cruel truth hidden behind this case, a heavy price that is unbearable...