C320 Heaven Man's Finger!

According to the news he heard from the people in Fayedge, Isaac was called Master Quarles because Duane had given him a copy of the Atmospheric Tyrant Technique. Even if he was called "Master", it should be related to the secret manual.

However, why was he so respectful to him?

He even felt that the relationship between the two of them was like that of a boss and a lackey