Here are several reasons as to why I believe south korean youths are unemployed:
All STEM majors I've met/talked to on the other hand have done pretty well. I've never seen an unemployed stem major. They may not like their work conditions, or their promotion options, but these kids have skills needed by employers, and their pays aren't too bad for korean standards. Even those who went to a 2 year college, or learned a trade/skill, these kids have no trouble finding employment, and have relatively good working conditions.
Also, I'm not understanding the decisions all these koreans at US universities going into the econ major. I'm pretty sure that at least 50% of the koreans I've seen at US universities, come here to get an econ degree. It kind of stings to see koreans come to the US, pay mad $$$, (200K sticker price) for an econ degree that won't get them a consulting/finance job in the US(99% don't get one), and most don't get a job in korea in either of those sectors either. The lucky ones will get into a major korean corporation, but those are the lucky ones. The unlucky ones... At least the ones with the luxury of studying abroad are rich...
The ones doing STEM majors at my school on the other hand will get picked up by companies in the US due to having an actual hard skill learnt in college, or go on and get their phd's/masters and go on to teach, get jobs, etc.