Kumiho is the Korean equivalent of the Chinese huli jing and the Japanese kitsune. She is a mythical, devious fox, disguised as a woman, who plays tricks on humans. While the huli jing and kitsune may bode good or evil, a Kumiho tends to be only evil, though early texts suggest the Kumiho was once more similar to other mythic foxes in this regard.
Allowing you another reward if you win a battle, this card makes you draw 2 cards from the hand of the defender. The only protection from it is the Mimic.
Because you have a +1 when attacking, and rewards can only be obtained by attacking, she's an Attack Unit. Her battle reward gives you the opportunity to steal 2 cards instead of destroying the opponent or taking a card from their Village. Remember this does NOT happen if you lose; Kumiho is not like the Thief or Scout in this regard.