Description："Nightmare Teacher" is a school mystery drama. In the drama, in the daily life of a certain high school, students fall into strange, wonderful, and irresistible sweet temptations in the moment of dreaming. Lee Min Hyuk plays Sang Woo, a sophomore student who is very curious and has a sense of justice. Together with his friend Yu Lin (Kim So Hyun), he investigates the suspicious events that occurred after the unidentified nightmare teacher Ha Bong Gu (Uhm Ki Joon) was transferred to the school.