Then the two get into the counseling room with a fellow teacher and the fellow teacher asks them to delete the gossip website, which they accept, then Han Bong-gu tells them to write apology letters for making the website. In the end, Ye-rim and Sang-woo get a text message about someone (Han Bong-gu) who knows where are the missing classmates are located: a special classroom, where the missing classmates look at them very strangely. Ye-rim and Sang-woo start investigating the case and Sang-woo takes pictures about the clues and launch a gossip website about the investigation. Class president Ye-Rim notices the disappearance of her classmates while her friend Sang-woo and the rest of the class don't have a clue about their disappearance. Дespite Han Bong-gu is seemingly well known to all other teachers, he is not on any staff list and no one knows the real identity of the mysterious teacher.Дuring the series, strange events happen to several students in the classes after Han Bong-gu takes them to the counseling room, offering them to fulfill their deepest desires by signing a blood contract with them and giving them an enchanted item, but none of the students actually read what is the contract they sign, and they're late when they realize what was the price of their desires and they disappear into the void. After the homeroom teacher in Yosan High School gets hospitalized due to an accident, a new substitute teacher, Han Bong-gu replaces him in the second and third classes.

How much episodes in nightmare teacher