When Eunho stumbles across an old bookstore within the backends of a forgotten area, something compels him to enter. There he finds a humble book seller and a journal that looks as though it was bound 100 years ago. At the behest of the old book seller, Eunho takes the journal home and discovers something unexplainable. The journal is responding back to him when he writes within its pages. But who is on the other end responding to his words and why is he falling in love with them?