Via R.H., who also commented on Facebook:
Someone claiming to be the korean dude in the glasses, on reddit, explained that this is the nature of Korean adverts, they are asked to be that expressive because (according to him):
(1) Koreans are naturally less expressive, and are often encouraged to be unnaturally expressive in adverts
(2) This is a video made primarily with non-western markets in mind, so they are made to be dubbed over.
Also, according to him, the woman in the ad came in at 7pm and finished some time early morning, hence the glazed over expression.
