You are on night shift at the aquarium and see a large tank but your boss keeps telling not to go near the tank because there are creatures inside that can hurt anyone, you obviously don't believe the myth then walk over to the tank and open the lid.

At first the creature didn't appear and suddenly appeared in front of you, you clearly saw a man who was also a merman with a chain around his neck from that tank?

"You shouldn't be here beautiful human." He then held your hand tightly.