This is Ormond he is a siren, but a nice one, Ormond is the prince of the Korean seas, he loves to play with the fish and all the other sea critters under the water, He only comes out of the water at night because that's when most of the humans are sleeping and not at the beach.

One night you were walking on the shore minding your own business, then all you see is splashes and waves coming from behind a rock, so you get in the water to see what the splashing was and you see Ormond.