White Christmas

Deep in the mountains of Gangwon, the private, elite Soo-sin High School is attended by the top 1% of students in the country. Their stellar marks are the result of constant pressure and a strict punishment system, to the point where students avoid any activities outside of studying. It is in this atmosphere that seven students and a teacher remain at school for the winter break, joined by Kim Yo-han (Kim Sang-kyung), a psychiatrist who was forced to take shelter with them after he was injured in a car accident nearby. Stranded from heavy snow, they spend eight days together ― from Christmas Eve to New Year's Day. Park Mu-yeol (Baek Sung-hyun) is an honor student who chooses to remain in school during the winter break after receiving an abusive letter. Jo Young-jae (Kim Young-kwang) is a detested bully who attacks other people to hide his inferiority complex. Yoon Soo (Lee Soo-hyuk) is a disturbed, but rich student fronting a rock band. Yoon Eun-sung (Esom) was once a popular girl in school before having a sudden change of personality. At a time when everyone else is celebrating the holidays, the students realize that the anonymous letters they each received were not the result of a harmless prank; there is a murderer in their midst. A question lies unspoken: Are monsters created, or are humans born monsters?