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.
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Uhm Ki-joon
Han Bong-goo (19 episodes)
Kim So-hyun
Kang Ye-rim (19 episodes)
Lee Min-hyuk
Seo Sang-woo (19 episodes)
Seo Shin-ae
Kim Seul-gi (19 episodes)
Baek Seung-do
Oh Ki-chul (19 episodes)
Kim Ji-ahn
Do Do-hee (19 episodes)
Jang Kyoung-up
Cheon Jae-su (19 episodes)
Kim Da-ye
Ahn Si-yeon (19 episodes)
Kwon Young-min
Lee Jong-seok (19 episodes)
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