So OG maythan knew the duke, so I wonder that he thinks about the new maythan

Prolly the same, since the the og maythan have the same personality as the new maythan according to the new maythans sister, and Duke did said that he's glad the the new maythan is still the same even with amnesia

I must have been reading too fast that I don't remember that part lol

It was in the first few chapters so it's easy to forget as you progress in the story ٩(๑❛ᴗ❛๑)۶