"The little mermaid inspired Kaisoo ff"
Except KS is not an innocent defenseless mermaid. And theres a lot of "racism".

Jongin thought being a prince was annoying, facing responsablity was something he'd avoid. Therefore he turned away from the truth and he ran away from himself.

But He hadnt known to be destined for something bigger. 
He hadnt known he had the power to change the horrors of the ongoing war, To be the hope of his suffering people. 

Now that a siren, the most hated species and the enemy to humans had saved his life and uncovered things about the war aswell as their past as they find out just how important their story was to history.

He hadn't expected to find a liking to it's feisty and strong spirit, its stubbornness and bold tongue, speaking out things to him no one has dared to before. 
Things he needed to hear.

He didnt know that falling for the enemie was the best thing that could've happened to him.
When the change of the world had started with a monster saving another.

The Enemies Blood (Boyxboy)

Jongin woke up sweating as he had to sit up gasping for air, he stumbled toward the window holding onto his stomach as he desperately searched the threat he felt the presence of with his eyes, touching his belt for his sword but he didnt have it.

He panted looking around the room as it only seemed to spike his panic more and he looked out the window to see the patrol by the gates, one sleeping while the other was cleaning his helmet.

They're unprepared when something is coming.

He concluded as he rushed over to the doors opening them, ready to run off and first search for a sword when a guard had stopped him gently.

/" we need to get to the gates, something is happening.. we aren't armed enough, wake all the knights now /"

A Key to Becoming