Yoo Jimin is a lost cause as she feels her life is going downhill but not until that night where she decides to check out for the first time the old public library she always passes by in her daily en route in their town for a change, where she discovers a wrinkled and almost torn polaroid portrait of an unknown woman with words written on the back of the photo that is used as a bookmark of the ripped missing pages of the book. Jimin keeps the book and the photo and ever since that night, the universe is now on her side. And in a spur of the moment, she decides to find the girl in that photo, as she slowly regains her purpose in life along the way with the help of memoirs and clues hidden in the book, of searching and meeting the mysterious girl.