Lee Seung Ki is a man who meets a girl and falls in love with her. The girl is actually a gumiho, a legendary fox with nine tails that eats the livers of humans. When he finds out that she is a gumiho, he ends up doing crazy things to prevent the girl from eating his liver.
Cha Dae Woong(Lee Seung Gi) is a cowardly and extremely immature man who accidentally set free a nine-tail fox (Shin Min Ah) who was imprisoned for 500 years. The fox began to take the form of a beautiful woman who follows the man who set her free around, causing misunderstandings that she is his girlfriend. Although the man enjoys the attention and envy that people around him is giving, he is also always in extreme fear that the Gumiho may want to feed on hisliver to become human. But when both of them falls for each other as time goes by, the Gumiho's enemies appears causing an unexpected twist in their lives.
