Kim Yo Han is a psychiatrist who gets involved in a serial murder when his car broke down on Christmas Eve during a sudden storm and he is forced to take shelter at a private high school. Seven students and a teacher are also there over the winter break, but they are gradually murdered one by one as they receive letters from a killer who wants revenge for the death of his mother and sister.
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Kim Sang-kyung
Kim Yo-han (8 episodes)
Baek Sung-hyun
Park Mu-yeol (8 episodes)
Kim Young-kwang
Jo Young-jae (8 episodes)
Lee Soo-hyuk
Yoon Soo (8 episodes)
Kwak Jung-wook
Yang Kang-mo (8 episodes)
Hong Jong-hyun
Lee Jae-kyu (8 episodes)
Esom
Yoon Eun-sung (8 episodes)
Kim Woo-bin
Kang Mi-reu (8 episodes)
Sung Joon
Choi Chi-hoon (8 episodes)
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