I love asian horror like this, it tends to prey on your nerves rather than try to shock you with explicit gore.
The story begins with Ji-won, who has published sex scandal articles and begins receiving threatening phone calls from a stranger who is following her. To put a stop to this, Ji-won moves house, changes her mobile phone number and then, unfortunately, her problems really begin.
When Ji-won's niece Young-ju (played by an adorable little girl who is obviously enjoying herself immensely and completely shows up all the adult actors) answers her aunt's phone in an art gallery, it sets off a chain of increasingly alarming events surrounding Young-ju which forces Ji-won to investigate further - is it really the men she has exposed who are threatening her or is something more sinister at work? No prizes for guessing!
Ji-won's investigations into her new, seemingly haunted phone number lead her to two deaths and a missing teenager, the missing girl's terrified friend and the unravelling of a mystery which leads her to a shocking conclusion.
This film features an extremely spiteful, vengeful spirit (hell hath no fury..) you find it hard to sympathise with until the end of the film. To say any more would spoil a good plot, this film in my opinion ranks with the likes of Ringu, a Tale of Two Sisters, Dark Water, etc. If you are familiar with these titles, you won't be disappointed.