>>85266
Old lore. In Korean folklore, gumiho are fox demons. Kitsune are occasionally malicious. Huli jing are often malicious. Gumiho are cruel and duplicitious, and, by human standards, psychotic. They are not human, and using that label attributes traits to them that they do not really have. Gumiho, though, are best avoided. They are essentially man-eating storybook monsters, cunning and cruel.
I don't know if you're at all interested in the SCP stuff. SCP-953 is a typical gumiho. The material there is not fur the faint of heart.