He was invited by the Emperor many times in the past, but every time, he was scared of the Emperor. It was because he had seen how strong the Emperor was.
The Emperor was the most dangerous Pureblood in the Elzeiran Empire.
Usually, the Sea King couldn't even dare to test the strength of the Elzeiran Empire, worried that the Emperor might capture him instead.
However, this time, he was sure that the Emperor wasn't going to do it. Even if the Emperor was strong, he probably wasn't going to fight because he was saving strength for the war that was to come.
The Emperor had a bigger enemy, so the Sea King was certain that even if he came now, the Emperor wasn't going to pay as much attention as he would have given him in the past.
Still, the Sea King was careful and respectful. He didn't create much trouble and followed the General, who was much weaker than him.