Spirits of the Sea

A brief description of the manga Spirits of the Sea:

One day, sea demons suddenly attacked the village.
Han-cheon, the protagonist who lost his mother after the attack, he thought she was killed by the haegui.

He then learns that his mother is alive and has been kidnapped to be eaten.
Our hero goes outside the village, he wants to find and save his mother.

For the sake of saving his mother, he is ready to walk a dangerous path…