This "Murloc"-ish fish creature swims around the world looking for pirate ships to make contracts with. The contracts give  the pirates permission to use it's light to guide to treasure that they haven't gotten yet. After the treasure has been retrieved, 해적 빛 gets the souls of five people on the ship. It stores souls in it's bag and with each soul, it's light gets brighter.

There a lot of requests from normal people, but it rejects most of them, at least if they don't have a bright enough soul, which could light up it's lantern.

It's brown side lets it breathe above water and mark paths, while it's red side allows it to breathe under water, with it's lantern finding treasures.

It prefers living above water in ships and sleeping 20 hours a day while not in a contract, because of it's lazy nature, it takes a while to find a new contract.