I had much the same experience both in China and South Korea. Students come to class expecting a super-fun teacher who will feed them knowledge without any effort on their part. I think this is largely cultural.

Chinese and South Korean students do not, as a general rule, look at Westerners as full human beings but as caricatures. They expect Westerners to look (white, tall, blonde, blue eyed) and act (wild, crazy, dumb as a rock) a certain way, and are almost invariably dissapointed when these expectations go unmet. This, combined with a cultural submissiveness/passivity that does not encourage the development of self-reliance in learning or much else creates an atmosphere where you are looked at as the actor, expected to play a part and they are the audience, accustomed to and expecting a certain kind of performance.