Kumiho

A kumiho (gumiho) ( Korean pronunciation:  [kumiho]; Hangul: 구미호; Hanja: 九尾狐, literally "nine-tailed fox") is a creature that appears in the tales and legends of Korea.

Dictionary
Deriving from ancient Chinese myths and folklores, 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).