Eun Sun, who works as a librarian, meets a guy in the library. Everyday, this guy rips off a certain page of a book. She starts to get interested in his story and every time they meet, she finds out more about this strange character. When she finds out he's searching for a love letter of his deceased girlfriend, she helps him finding it trough the books. While they get more close, she happens to find out his girlfriend died in a car accident. She'll do everything to help him, and to find out more about him.