Are you referring to the Wisconsin incident back in 2004? If so, that individual was Hmong who are from Laos and Vietnam, not Korea.
Minnesota and Wisconsin have relatively large Hmong populations. Unfortunately, their start into hunting under a US game mgmt model started very poorly (I put a lot of blame on the state DNRs for not seeing an issue and requiring they first be trained in US game mgmt/hunting). In short, they trespassed everywhere, even when posted, and literally shot everything that moved, including non-game & out of season species. It was rampant and you can only imagine it if you personally witnessed it. This left a VERY bad impression of them on long time hunters who were always running into them on their private properties. In the Wisconsin incident the Hmong guy was sitting one of their treestands and was informed he was on private property and asked to leave, but refused, and it escalated.
Again, I put most of the blame on the DNRs for not putting training programs in place much earlier. You cannot expect immigrants, many who spoke no english at all, from an entirely different hunting culture to understand modern game management principles and laws.
Fortunately, over several decades now, they have learned what they needed to and the situation is far better...no different than any other hunters. I have spoken to numerous Hmong at a gun range I go to and frankly, I'd rather shoot next to them than most of the rednecks that show up violating many range rules and don't clean up after themselves. The Hmong are polite, courteous, and always clean up their target litter and empty shell casings, etc.