Four friends pledge to commit suicide together but while standing on the ledge, only one of them actually jumps. Her ghost begins to haunt the remaining friends until the pledge is fulfilled.
A Blood Pledge is a 2009 K-Horror film, and the fifth installment of the Whispering Corridors series of South Korean horror films set in girls' high schools that began with 1998's film of the same name. Aside from the setting and overall themes, it is unrelated to the other films in the series.