15 parts Complete Two people meet through a series of anonymous notes exchanged at a café, but they are unaware of each other's true identity. These letters are written with invisible ink, and it is only under certain conditions-like sunlight or a special chemical-that the words are revealed. Their correspondence grows into a deep romance, but the mystery of their identities keeps them from fully connecting. Will they ever meet face-to-face, or is their connection confined to the written word?