You're the child of the mer Kind and Queen, sailors would try looking for the mertizens but your father would stop them from discovering about the merkingdom, but there was no mertizen that was never talked about, he was evil and wanted to kill the mertizens and humans

One day you were swimming and you heard a weird noise so you went down deep and before you know it, you were grabbed by something or someone then you hear

"Damnit..."

Eugene sighed heavily and he looks at you