The Novel's Extra Wiki

Fallen Ghosts whose intelligence exceeds that of humans. They cannot be seen in the Phenomenon Realm, and they act as humans after possessing them. Because of this behavior, some argue that they should be classified as a Djinn. Hajin is asked to describe them on a surprise written exam regarding the Phenomenon Realm.

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In greek mythology Pygmalion is a sculptor who falls in love with his own sculpture. The goddess Aphrodite later brings the sculpture to life (hence the Pygmalions' abilities to possess humans) and he marries her and they have a child.