Amy woke up from the cold bathtub and found that she seemed to be banned in an old school. The body was dark and scary, and there were some rustles on the mottled wall. During her forbidden period, she could only rely on her thoughts. As a doctor and at the same time the mother of his wife and grief, he was unable to understand the fact that my son had fallen asleep because of an accident, and believed that his son was also trapped in school. In this magnificent, supernatural school, Emily, mired in darkness and longing, wants to find her son. She constantly breaks the rules of "school," and as Amy encounters horrible evil creatures living in "school," daunting supernatural forces and inner fears ensue one after another. is she fighting these horrible creatures or her own demons?