Sun-ju (Shin Eun-kyung) is a journalist. She finds out her niece died at the same hour as three of her other friends, all in different places. With her suspicions aroused, she asks for help from Choe Yol (Jeong Jin-young), a neurosurgeon who has fallen into disgrace. He performs autopsies on the dead and claims their deaths could only have been caused by something other than natural causes. The only clue is a video full of strange images and sounds which which concludes with a message saying "You will die in a week. If you want to survive..."

This South Korea-Japan co-production (featuring the debut role of Bae Du-na) is based on Koji Suzuki's bestselling novel, itself made into a successful Japanese (and later Hollywood) series of 'Ring' films...