Spirits of the Sea is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.nl fastest updating comic site. The Summary is

The seagulls that suddenly hit a village one day.
The protagonist, Han-cheon, who fled the village to find a way to live after losing his mother to a seagull, It is learned that the mother was not actually killed by the haegui, but was kidnapped for food.
Han-cheon goes on a dangerous journey to save his mother...