The Silenced (Blu-ray release 2015-12-21) is a Korean mystery thriller.  A sick girl is transferred to a school with a Japanese headmistress.  The Korean students in this school compete for two positions to be sent to Tokyo based on their physical abilities.  After one third of the movie for set up, the protagonist witnesses a girl with a lot of blood, who then disappears.

This is not exactly a traditional horror movie, and is not for those who want a fast paced horror movie.  However, it does have a few scares which are done effectively.  Its strength actually lies in the atmosphere and the solid screenplay, which gradually unravels the mystery.  This type of subject is not usually favored by the West, so the story feels fresh.