One day, typical South Korean highschool student Hae-Un visits a swimming pool, is sucked into a mysterious whirlpool and loses consciousness. When she comes to, she finds herself deep inside the ocean. And she meets Ellime, who declares he is actually her father... Hae-In learns that she was born from the Spirit King and her half-elf mother. Can she survive the world that she has been thrust into?

(Source: Copin Comics, edited)