Pureun Goemurui Kkeopjil

The Monster Who Fell in Love with Its Prey, and the Child Who Fell in Love with That Monster.

A blue-gray monster born in the forest. He discovers a child abandoned in his territory and brings it to his lair. Not to care for it—but to devour it. The child, Fernin, survived under that monster. Years later, the grown child stands before the monster once more... The monster who came to love the child that was its prey, and the child who grew fond of such a monster. Time begins to flow again for the two reunited after over a decade.

(Source: Ridibooks, translated)