What would you do if you realize that there is something not quite right about your school? Kang Ye Rim (Kim So Hyun) is the president of her class and the top student. The seemingly perfect student becomes concerned, however, when she begins to feel that something strange is going on with her teacher, Han Bong Goo (Uhm Ki Joon), and the other kids in her class, including her friend, Seo Sang Woo (Lee Minhyuk). Everyone around Ye Rim seems to fall into a trance, and then her classmates' dreams seem to become reality as soon as they dream it. Can Ye Rim uncover the reason for these strange occurrences before it’s too late? “Nightmare Teacher” is a 2016 South Korean web drama series directed by Hyun Moon Sub.