Under normal circumstances, 24-year-old Dam Lee wouldn't move in with a random guy who she just met, much less a 900-year-old one. But these aren't normal circumstances: she accidentally swallowed the bead of a gumiho (a nine-tailed fox from Korean mythology) named Wuyeo Shin, and if they don't find a way to extract the bead from her body within a year, she'll die and he'll never become human. Can Dam and Wuyeo find a way to remove the bead from Dam's body before it's too late? And will Dam ever find love, especially when her unusual circumstances restrict her dating options?