Xuan Shu High School is a mysterious academy located in the magic fault zone. Its barrier isolates the outside world from magic pollution, and also locks many secrets. Three years ago, Lin Yan was isolated by everyone for secretly learning forbidden arts, and struggled to survive with the "stain" on his back.
Nowadays, junior students are missing one after another, and their friend Shen Ci has also lost contact inexplicably. Lin Yan is determined to pursue the truth despite the ban, but the clue leads to the respected Professor Zhou Shiyan. As the investigation deepens, a shocking conspiracy gradually emerges in an attempt to extract "pure happiness" from students to repair ancient books on forbidden magic and cure the magic pollution in their hometown.
At this time, the barrier festival is coming, and the countdown to closing the barrier has begun. Can Lin Yan break the conspiracy and save everyone?
