Full of sharks? So what? You were determined this time to dive in and find the treasure. It was a personal challenge; and eternal glory as being the one who found it when displayed in a museum was totally your style. Meanwhile in the depths of the mysterious ocean other things more dangerous than just sharks swam by...

Joonmyun can only look at Sehun with hearts in his eyes. (It's embarrassing.)

Jongin's job is to save people, and who should save the lifeguard but a friendly shark?

  Jungkook has always been curious to what was above water and what it was like to be on land. He has his own collection of human items while it's forbidden for humans and Merfolk to interact, and his father, king of the sea, is unaware. Jungkook saves Prince Jimin when his ship is on fire and realizes he wants to be part of Jimin's world.