The fifth and last film in the Whispering Corridors series (1998-2009), A Blood Pledge does not dramatically change what is by this time a very successful formula. Set in an all-girls high school – as are the previous films – the film focuses in on the fractures to the close friendships between three girls – So-yi (Son Eun-seo),  Yu-jin (Oh Yeon-seo) and Eun-young (Song Min-jung) – in the aftermath of a suicide by one of their classmates, Eon-ju (Jang Kyoung-ah). Soon, the girls are seeing the ghost of their dead friend and become afraid that she is out for revenge. At the beginning of the film, we see the three girls signing a blood pledge, underlining their intentions to commit suicide. But what does this have to do with the suicide of Eon-ji, if anything? And are they being haunted by their guilty consciences, or has the ghost of Eon-ju really returned to take her revenge?