Have you never wondered, with fear at the full moon at night, where kuмихо come from? Mieён, an eighteen-year-old girl from Seoul, has a secret—she’s a kumiho, a nine-tailed fox. To survive, she needs to devour men’s energy. Seoul is the perfect city for this, because nobody will believe that dark fairy tales are actually true. But one day everything changes. In one terrible night, Miён saves Jihoon, a young man who becomes a goblin’s victim. Against all common sense, she helps him—and pays for it cruelly. Their fragile friendship gradually blossoms into something magical, but, as in any fairy tale, a choice stands before the heroine: immortal life or Jihoon. So what will she choose?