[A dramatic difference, and one which tells Kratos as much about the man as the society. Or confirms what Kratos already suspected about the man, anyway. 'Master Ka-Fai' outside of the house or around others, then; Yuan in private.]

Very well -- Yuan.

[It's possibly the first time Kratos can remember saying his first name out loud.]

I'll get started on those chores.

[Kratos bows slightly, enough to be respectful but not deep enough to be subservient, and proceeds to move back toward the kitchen to take care of the dishes first.]