While trying to buy the house in which the In family lived, In Yoon Joo gets scammed and goes to meet her twin sister Kang Sun Jun for help. Her sister is a doctor who specializes in healing people with somnambulism. She gets mistaken for her sister by CEO Moon and she later finds out that her sister had to go out of the country urgently. While going home, she gets stuck in rain and enters a book store where she feels like she's with her father, the same feeling another Luna member, Seo Woo Yeon has. (Source: XieLalisa at MyDramaList)