A homeroom teacher of Yosan Private High School has an accident, and thus a substitute comes to fill in. Han Bong-Gu is a mysterious man, and after strange occurrences the class president Ye-Rim tries to get to the bottom of this mystery.

casts

Uhm Ki-joon

Kim So-hyun

Lee Min-hyuk

Seo Shin-ae

Baek Seung-do