Leader of the Hyean-gers. 23 years old. Male. Loves teasing others. Nicknamed Park Young-sik, though he claims it's not his real name. Homeroom teacher for Class 5. PE teacher. Dating Guest. Uses casual speech.

Uses a dialect. 24 years old. Male. Stutters frequently. Also called 'Mundi Menpa'. Homeroom teacher for Class 4. Career Guidance teacher. Uses casual speech.

Cool-headed. 23 years old. Has a voice similar to Hyean's. Male. Sometimes stutters. Homeroom teacher for Class 1. Korean teacher. Dating Yunyo. Uses casual speech.

Female. 22 years old. Good at creating catchphrases. Famous for saying, "Kimchi! If it's not Aoni, I'll take a dump at Gangnam Exit 11 tomorrow!!!" Cheerful. Homeroom teacher for Class 3. Music teacher. Uses casual speech.

Female. 22 years old. Uses a soft, light dialect. For example, says things like "Hello-siwayo." Homeroom teacher for Class 2. English teacher. Uses casual speech.

Female. 21 years old. Has a unique voice. Extremely high energy and bright. Homeroom teacher for Class 7. Art teacher. Dating Yeonho. Uses casual speech.

Female. 20 years old. Studied abroad in Canada. Homeroom teacher for Class 6. Math teacher. Uses casual speech.

Female. 22 years old. Extremely high energy. Legendary vocal volume. Homeroom teacher for Class 8. Home Economics teacher. Uses casual speech.