After Im Nayeon lost both of her parents, she starts living with her japanese best friends, Myoui Mina, Hirai Momo, and Minatozaki Sana. They are living in a hundred year old mansion that Myoui family bought when Mina is still a kid. As time goes by Nayeon found a company from a person she would never expect. Someone she could tell all her pain and feelings, thoughts and insights. Someone she never met but yet she felt connected with. She fell fast and fell hard to this girl. But what she didn't know is that.. this girl died exactly in September 22, her birthday, but a hundred year ago.