It's really too polite.
You could even say it's excessively polite.
This little princess seems to represent the humble and polite side of the Dongying people.
Jiang Chen was a bit dumbfounded, caught off guard, unable to react, only to see Koda Kaoru giving him an encouraging look.
Sure enough.
There's no such thing as a free lunch.
"It's been too long, I don't quite remember, better let Teacher Xiang Tian tell it."
Jiang Chen declined, not out of ingratitude, but he simply couldn't bring himself to do it. Although he didn't know how the Imperial Family paid Koda Kaoru, wasting class time on the Journey to the West seemed like deceiving children.