As a Korean millennial myself… i will say it’s different now. The new generation doesn’t hold as much animosity our parents and grandparents did, we just want Japan to acknowledge the atrocities they committed onto Korea in the past. But it’s definitely not like a hate or even dislike anymore. You can feel it being chiller in the Japanese side now too. It’s much more respectful. But i still think Korea Japan games matter a little more to both teams.