"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)

/" shit !/" He jumped flinching away from nothing in freight.

It made him groan and grunt as he was slowly sitting, moving on the quite hard ground and at some point he released the things that hurt him where the sharp stones of the coast which he had been laying on.

He cough a little swallowing as he recalled what had happened. Causing His eyes to look around, landing on the body that was still half in the water.

He crawled forward in a mess to get to it as he realized it was the very siren who's actions he couldnt wrapped his mind around.

Jongin pulled from under its shoulders dragging it fully out of the water carefully yet in a hurry as it seemed to be so motionless losing the little scales that were left on his bruised legs, he lowered it again onto the ground collapsing to his knees besides it and taking a few breaths. He sniffed whipping over his nose as it itched before be cupped its face making it face him.

/" hey /" he called in demand with furrowed eyes waiting another second to have no response once more.

The prince lowered his hand placing his finger on its neck to feel the faint heartbeat before his eyes travelled downward to see the open wounds it was still suffering from.

Swallowing nervously and still overwhelmed by the incidents he cursed under his breath taking his soaked shirt off to pull it over the sirens body watching the fabric turn red on various spots, which caused him to gulp somehow in guilt as he reached down slipping his arms under its body and pulled it up with himself carrying it in his arms again. And it didnt move, it didnt flinch or react as if it was already a corpse that he was carrying.

/" your highness !/" He instandly turned his head ready to dodge whatever was coming but he calmed a little when he realized it was one of his men.

In fact it was the very man that he had talked to on the ship. The man who had guarded the siren and warned him of the attack./" How are you alive ??I saw you sinking with .. with the siren !/" His wide eyes scanned his highness and the creature he was holding who's tail had turned back to 2 slim legs.

/" how are you Alive?/" Jongin answered with eyes looking down at his men

/" surely if you saw me sinking you would've performed your duty and done everything to save me/"

As his men didnt answer and instead folded his hands looking down ashamed jongin turned away taking big steps as he walked away looking out for people to help not only him but the siren bleeding out in his arms.

/" wait... please let me carry it /" the men followed his prince closely and jongin spared him a glance.

The certain Male opened and closed his mouth a few times before swallowing to stutter his name in surprise /" j-jongdae but ppl call me chen for short it means greatness /" he smiled cockily at the end and jongin rolled his eyes stepping past again.

/" hurry forward and see if you can find anyone or the castle we need help. /" he looked down into his arms and onto the unconscious siren while jongdae rushed away to follow his orders.

Jongdae was the kind of guard who didnt think of jongin as a god and the prince could tell. The kind of guard who follows what his own rational thinking is telling him and if he got close to him jongdae would probably be the kind of guy who would view him as a friend and give him his own true opinion ... but also protect him in fact because he cares and not because the prince is important.

At least that was what he hoped and if it didnt work out he might aswell sent the boy away afterall.

Something to consider