Park Nana has always thought that "twin telepathy" was just some made up movie thing that made everyone believe that twins held some weird power within each other. In Nana's case, she and her twin were as different as water and fire. While one twin was hot-tempered, the other was quiet and stuck in her own little bubble. What happens during a gruesome night when Nana's twin, Na Young, suddenly disappears out of thin air and everyone believes she's dead several months later? Nana is sent in her deceased sister's place to marry the heir of Kim Corporation in order to save her father's business that is going bankrupt due to a wrong investment, but as she starts to settle in with her marriage, Nana also begins receiving threatening clues connected to Na Young. Can she figure out her sister's disapperance, but at the same time manage to live peacefully with her cold husband?