Fang Ray Shin is a high school student who lives in Taiwan in 1962, during the White Terror martial law period. Troubles at school and home cause her to feel like only her counselling teacher, Zhang, understands her and she falls in love with him. She is also part of his secret study group, which includes Miss Yin and an 11th grade male student Wei Chong Tin, and reading the banned books let them feel liberated despite the danger they're putting themselves in. When one day Zhang suddenly disappears and Fang and Wei find themselves trapped in their school at midnight, they must now search for their missing teacher even as their school begins to turn into a realm where ghosts and spirits rampage...