Incheon Animals: Brilliant Blue Beetle

No idea what species this is.  I'm pretty sure it is a beetle but local hemiptera can look similar (and wonderful); below, taken at 600~odd meters altitude Gangwon Province, a hemiptera:

In a few months, I will have access to some insect guides and i will try to ID it then.  Man! Three animals into the Incheon Animals posts and I haven't IDed any. Shame!
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Mostly as a reminder to myself, this article on beetle diversity on a tall Gangwon mountain looks interesting for my Gangwon work.  This one might or might not be interesting.