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.
Sung Joon
Choi Chi-hoon
Kim Sang-kyung
Kim Yo-han
Lee Soo-hyuk
Yoon Soo
Baek Sung-hyun
Park Mu-yeol
Kim Young-kwang
Jo Young-jae
Kwak Jung-wook
Yang Kang-mo
Hong Jong-hyun
Lee Jae-kyu
Esom
Yoon Eun-sung
