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. 

Jimin is a curious merman who finds a chess board at the bottom of the sea and after weeks of trying to figure out its purpose decides to go and find a human who can explain it to him.

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

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

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...

"Merfolk are dangerous creatures. They lure humans in with their saccharine song and unnatural beauty, before dragging them to the most hellish depths of their aquatic habitat, drowning them, killing them slowly, watching them suffer. Merfolk view humans as food, playthings, maybe even breeding stock if they're desperate enough. If you haven't heard the stories, you may be tempted to establish a relationship with a fish-finned siren should you happen upon one. They may act kind, they may ga