Since Son Heung-min is the oldest, it's only natural to hold him accountable

The time for a generational shift has already arrived, and his form is gradually declining.
Instead of signaling a transition, they are trying to push through until the very end because they want to build everything around Son Heung-min.
As a result, the players who actually need a generational shift will stop playing for the national team.
The average age of the national team will rise, performance will continue to drop, and people will end up just blaming the manager.
That is how things end up in this state.