Rex heard this and couldn't help but think that the Executor was insinuating something.
It was the way he said it that made Rex think so.
A remarkably powerful backer? Could he be referring to the Hare Full Moon? In a way, the Lunirich Gods could be considered backers. But he knew that I only had two King Marks. Is he suspecting that I possess another King Mark? Could be.
Pondering calmly, that's the most plausible explanation.
Maybe the rumor of his rapid advancement to reach this strong made the Executor think so.
"Don't spout nonsense, I want Gistella back" Rex replied sternly.
Upon hearing this, the Executor's grin turned devilish as he stood up with his arms spread open to the side. "Well, there's no need to rush. How about we have a small welcoming celebration for you accepting my humble request?" He said with an eerily pleasant tone.