A rather ''Dark'' piece of Ancient Korean History – The ''Kumiho'' actually had no form. It assumed many shapes (much as a Shapeshifter). But it liked to become a ''beautiful Woman''. In this form, She could seduce Human Men and consume their Heart and Liver. In it's earliest form, The Kumiho was NOT seen as an Evil Creature, but a ''cute'' Fox-like Entity. In time though, it assumed this role in Korean Mythology (which is never explained as to why). The Kumiho was used in Literature as ''cautionary tale'' for ''wayward'' or ''impolite'' Young Men.
