Kim Hajun managed to kill all of those ancient mermaids until no one of them is left.
Kim Hajun slowly lost consciousness and then he fell to the ground.
When Kim Hajun fell to the ground his body made a loud booming sound wave even though he is still underwater.
That can only happen since Kim Hajun's dragon knight armor was very heavy.
The God of Time walked slowly toward Kim Hajun and then he observed Kim Hajun carefully.
He does that to check if Kim Hajun's body had any weirdness or problems.
After several times the God of Time tried to check Kim Hajun's body, but the God of Time couldn't find anything just as he checked Kim Hajun last time.
However, there is something that the God of Time has missed and that is the ten souls of the Ten Highest Angels that reside within Kim Hajun's body.
In the realm that was created within Kim Hajun's body, those souls were fighting and competing with each other to decide the one who will become the real Kim Hajun.