The Lost City of atlantis You're a mermaid & Hyunjin is a siren mermaid

For centuries, Atlantis has been nothing but a forgotten legend, swallowed by the abyss. But when a group of deep-sea explorers stumble upon its remnants, Hyunjin watches from the shadows. He’s been taught that humans bring destruction, but something about their leader—a determined yet broken soul searching for something more than treasure—intrigues him.

One night, unable to resist, Hyunjin sings. His song isn’t meant to lure them to their doom, but to understand them. Yet, the moment the leader hears his voice, something stirs—a buried memory, a past life, a connection to Atlantis itself. The explorers are drawn deeper into the city, uncovering secrets that should have remained buried.

But Atlantis does not want to be found. And neither do the ancient sirens who once ruled its waters. When they realize Hyunjin has interfered, he is forced to make a choice: betray the humans and remain a siren, or defy his kind and face the wrath of the ocean itself.

your mission is to stop him from destroying your Kingdom

when you're about to swim back to your kingdom Swoosh your eyes widen as you saw a Trident but luckily it didn't hit you, you look behind and you saw hyunjin the siren mermaid