Canada

Hope those 4 are already on their planes home after their bosses realized they hired trash.

If you have to share space with them again, may I suggest bringing up what it's like being a "migrant worker in Korea"? Groceries are a little different, you miss your oven maybe, the usual foreigner small talk, but keep using the term migrant worker (or temporary foreign worker, for those racist Canucks). When they correct you with the term "expat" - as their beliefs dictate they must - ask them to explain the difference and don't let up when they deflect. Insta explody heads every time.

I'm really sorry that happened to you (and anyone else in the bar who had to witness it). Even more sorry that Korea keeps getting the dregs whose only marketable skill is their ability to speak their own language. Guaranteed, each of those assholes has at least 1 dramatic story about how really racist Koreans are against white people though (like, my coworkers weren't impressed that I can eat hot sauce, a woman wouldn't give up her seat on the bus when it was was obvious my feet hurt, nobody cares I can do the Gagnam Style dance, where's the Korean wife I was promised, etc).