@DodecahedricDroughnut I haven't read the source material, but I hope that they do change that.
I get that Koreans don't like the Japanese, & sometimes have a raging hard-on seeing them suffer, but at the end of the day this is a world wide opening of S-Rank Gates. Therefore someone, anyone, should be able to see the connection & realise that these aren't individual Gates but instead an invasion force with multiple beachheads. If you don't stop the monsters in Japan from getting a foothold, then the surrounding countries will also be fucked over.
Oh look, who's next door to Japan? Why, it's perfectly perfect Korea, who at no point in their history has done anything horrid to another nation or people. They will surely be left alone.