Lee Kang-in feels very different in the national team compared to his club

It feels like his entire mindset changes between being with his club and being with the national team.
At his club, he even has the image of being a dedicated player.
You almost never see him in any trouble at his club,
but with the national team, it feels like he just ignores everyone.
If he feels the team quality is lacking, shouldn't he be trying to fill that gap himself?
He is playing with the national flag on his chest; I wonder if he fails to feel that weight.
But then again, I don't think it's because his mindset changed from living abroad for a long time;
it seems like his innate personality and temperament never change.