Nice thread and nice questions..

The discussion is good as well.

The big questions about "I always wonder about the extent of knowledge of a Phd student."?? and "What after Phd?"

I am also a Phd candidate here in Korea. I never wanted to do phd after I completed my masters, but you know the conditions back home. As a result, I gave it a go.

One of my professor had said and I think he said well- that when you complete your bachelors degree you boast like you know all in your field, when you do your masters you realize u know a very little about your field and while in phd you think you don't know anything at all. Further more, if you go beyond that like post doc or something, he said you start to feel that nobody knows anything at all. 

Staying at the lab for more than 14 hrs a day, u feel you know nothing.u are not sure about the depth in knowledge you have gained.

Here in Korea, profs are crazy about writing papers,.. papers papers and papers. There is a cut throat competitions among themselves and the grad student need to do that for them. 2 journal papers in IEEE for me - minimum demand..If you are in the field, you can understand whats that.

I knew it was a hard job, but neva knew it was this hard.