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.
Top Cast
Sung Joon as Choi Chi-hoon
Kim Sang-kyung as Kim Yo-han
Lee Soo-hyuk as Yoon Soo
Baek Sung-hyun as Park Mu-yeol
Kim Young-kwang as Jo Young-jae
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