1. A trailer for a film called "Karen" introduces the story of a girl named Karen who was murdered at a Korean international school in 1960. In 2016, a new girl named Mary joins the school and connects with Karen's spirit, awakening it. Strange events then start occurring at the school, with lights flickering and a mysterious person roaming the halls with a knife. The film appears to be a supernatural thriller about Mary investigating Karen's decades-old murder.