In the era of spiritual recovery, Lin Yu was admitted to the top psychic school in the country as he wished, but found that he was assigned to the legendary "Midnight Department" - he was the only one in the whole school, and the class location was always after dark. The empty classrooms, weird teachers, and bizarre courses made him increasingly uneasy. What's even more frightening is that the three top academic roommates in the same dormitory will sleepwalk to his bedside on time every night and say in unison: "Welcome to the Fourth Era - your acceptance letter was obtained with our lives."
