There were indeed some demons that did not live in the demon realm, and one of the demons that did not live in the demon realm was the sea demon. Sea demons were actually similar to fish demons, but they would not be able to live far from the sea, and that was why they chose to live in the sea.
The West Sea was one of the places where sea demons lived together, and Yu Ming had also heard of that place before he heard Xue Mingyu mention it.
After hearing Xue Mingyu's answer, he did not immediately utter a reply, and he seemed to think carefully about the Demon King's explanation. 'After all, fish demons are actually similar to sea demons, and it is indeed possible if a fish demon wants to learn some techniques from sea demons,' he thought to himself.
Even if Yu Ming had heard of sea demons, he had never encountered them before, and that was why he was unsure how Xue Mingyu had ended up learning some techniques from those demons.
