Thomas stumbles upon an old diary in an antique district. As he begins to read the haunting tale of love and loss, Thomas realizes the diary carries a terrifying curse. Written many years ago by Jeong Hoon, an aspiring author, anyone merely exposed to the diary becomes a cunning facilitator of the curse. Even Thomas's girlfriend becomes his enemy. With no one to trust, Thomas desperately pursues information about Jeong Hoon and read morethe diary itself. He embarks on a treacherous journey and discovers increasingly disturbing details about Jeong Hoon through dark, mysterious encounters with devil worship and even his own past.