The Tailless Merman Returns as Sea God - Episode 1

Poseidon dispatches Arthur, a powerful warrior, to return to the Merfolk Kingdom eighteen years after being cast out and secure the throne. As Arthur arrives, he encounters warriors from the current royal house, House Sterling, who are fiercely loyal. The situation escalates when they spot a human intruder in their waters and demand his immediate execution, invoking the Merfolk Edict that mandates death for any human found there.