Kumiho
A Kumiho (Gumiho) (Korean pronunciation: [kumiho]; Hangul: 구미호; hanja: 九尾狐, literally "nine tailed fox") is a creature that appears in the oral tales and legends of Korea. According to those tales, a fox that lives a thousand years turns into a kumiho, like its Japanese and Chinese counterparts. It can freely transform, among other things, into a beautiful woman often set out to seduce boys, and eat their liver or heart (depending on the legend). There are numerous tales in which the kumiho appears, several of which can be found in the encyclopedic Compendium of Korean Oral Literature (한국 구비문학 대계).
Mythology
Originating in Chinese myths dating back centuries before being introduced to Korean mythology the Korean kumiho shares many similarities to the Chinese huli jing and the Japanese kitsune. All explain fox spirits as being the result of great longevity or the accumulation of energy, with kumiho said to be foxes who have lived for a thousand years, and give them the power of shape-shifting, usually appearing in the guise of a woman. However, while huli jing and kitsune are often depicted with ambiguous moral compasses, possibly good or bad, the kumiho is almost always treated as a malignant figure who feasts on human flesh. It is unclear at which point in time Koreans began viewing the kumiho as a purely evil creature, since many ancient texts mention benevolent kumiho assisting humans (and even make mentions of wicked humans tricking kind but naïve kumiho). In later literature, kumiho were often depicted as bloodthirsty half-fox, half-human creatures that wandered cemeteries at night, digging human hearts out from graves. The fairy tale The Fox Sister depicts a fox spirit preying on a family for their livers.